Allegheny County ( ) is a
county
A county () is a geographic region of a country used for administrative or other purposesL. Brookes (ed.) '' Chambers Dictionary''. Edinburgh: Chambers Harrap Publishers Ltd, 2005. in some nations. The term is derived from the Old French denoti ...
in
Pennsylvania
Pennsylvania, officially the Commonwealth of Pennsylvania, is a U.S. state, state spanning the Mid-Atlantic (United States), Mid-Atlantic, Northeastern United States, Northeastern, Appalachian, and Great Lakes region, Great Lakes regions o ...
, United States. As of the 2020 census, the population was 1,250,578, making it the
state's second-most populous county, after
Philadelphia County
Philadelphia County is the most populous of the 67 counties of Pennsylvania and the 24th-most populous county in the nation. As of the 2020 census, the county had a population of 1,603,797. It is coextensive with Philadelphia, the nation's ...
. Its
county seat
A county seat is an administrative center, seat of government, or capital city of a county or parish (administrative division), civil parish. The term is in use in five countries: Canada, China, Hungary, Romania, and the United States. An equiva ...
and most populous city is
Pittsburgh
Pittsburgh ( ) is a city in Allegheny County, Pennsylvania, United States, and its county seat. It is the List of municipalities in Pennsylvania#Municipalities, second-most populous city in Pennsylvania (after Philadelphia) and the List of Un ...
, Pennsylvania's second most populous city. The county is part of the
Greater Pittsburgh
Greater Pittsburgh is the metropolitan area surrounding the city of Pittsburgh in Western Pennsylvania, United States. The region includes Allegheny County, Pittsburgh's urban core county and economic hub, and seven adjacent Pennsylvania cou ...
region of the commonwealth, and is the center of the
Pittsburgh media market.
Allegheny was the first county in Pennsylvania to be given a
Native American name. It was named after the
Lenape
The Lenape (, , ; ), also called the Lenni Lenape and Delaware people, are an Indigenous peoples of the Northeastern Woodlands, Indigenous people of the Northeastern Woodlands, who live in the United States and Canada.
The Lenape's historica ...
word for the
Allegheny River
The Allegheny River ( ; ; ) is a tributary of the Ohio River that is located in western Pennsylvania and New York (state), New York in the United States. It runs from its headwaters just below the middle of Pennsylvania's northern border, nor ...
. The meaning of "Allegheny" is uncertain. It is usually said to mean "fine river". Some historians state that the name may come from a Lenape account of an ancient mythical tribe called ''"Allegewi"'', who lived along the river before being taken over by the Lenape.
History

Prior to European contact, this area was settled for thousands of years by succeeding cultures of indigenous peoples. During
the colonial era, historic native groups known by the colonists to settle in the area included members of western nations of the
Iroquois
The Iroquois ( ), also known as the Five Nations, and later as the Six Nations from 1722 onwards; alternatively referred to by the Endonym and exonym, endonym Haudenosaunee ( ; ) are an Iroquoian languages, Iroquoian-speaking Confederation#Ind ...
, such as the Seneca; the
Lenape
The Lenape (, , ; ), also called the Lenni Lenape and Delaware people, are an Indigenous peoples of the Northeastern Woodlands, Indigenous people of the Northeastern Woodlands, who live in the United States and Canada.
The Lenape's historica ...
, who had been pushed from the East by European-American settlers; the
Shawnee
The Shawnee ( ) are a Native American people of the Northeastern Woodlands. Their language, Shawnee, is an Algonquian language.
Their precontact homeland was likely centered in southern Ohio. In the 17th century, they dispersed through Ohi ...
, who also had territory in Ohio; and the
Mingo
The Mingo people are an Iroquoian group of Native Americans, primarily Seneca and Cayuga, who migrated west from New York to the Ohio Country in the mid-18th century, and their descendants. Some Susquehannock survivors also joined them, a ...
, a group made up of a variety of peoples from more eastern tribes.
European fur traders such as
Peter Chartier established trading posts in the region in the early eighteenth century.
In 1749, Captain
Pierre Joseph Céloron de Blainville claimed the
Ohio Valley
The Ohio River () is a river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing in a southwesterly direction from Pittsburgh, Pennsylvania, to its mouth on the Mississippi River in Cairo, ...
and all of western Pennsylvania for King
Louis XV of France
Louis XV (15 February 1710 – 10 May 1774), known as Louis the Beloved (), was King of France from 1 September 1715 until his death in 1774. He succeeded his great-grandfather Louis XIV at the age of five. Until he reached maturity (then defi ...
. The captain traveled along the
Ohio
Ohio ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders Lake Erie to the north, Pennsylvania to the east, West Virginia to the southeast, Kentucky to the southwest, Indiana to the ...
and Allegheny rivers. He installed lead plates in the ground to mark the land for France.
Most of the towns during that era were developed along
waterway
A waterway is any Navigability, navigable body of water. Broad distinctions are useful to avoid ambiguity, and disambiguation will be of varying importance depending on the nuance of the equivalent word in other ways. A first distinction is ...
s, which were the primary transportation routes, as well as providing water for domestic uses. Through the eighteenth century, both the French and the British competed for control over the local rivers in this frontier territory of North America. Native American bands and tribes allied with the colonists to differing degrees, often based on their trading relationships. The British sent Major
George Washington
George Washington (, 1799) was a Founding Fathers of the United States, Founding Father and the first president of the United States, serving from 1789 to 1797. As commander of the Continental Army, Washington led Patriot (American Revoluti ...
to expel the French from their posts, with no success. He also nearly drowned in the ice-filled Allegheny River while returning to camp.
The English tried again in 1754 to establish a post in the area. They sent 41 Virginians to build
Fort Prince George. The French learned of the plan and sent an army to capture the fort. They resumed building it and added increased defensive fortification, renaming it as
Fort Duquesne
Fort Duquesne ( , ; originally called ''Fort Du Quesne'') was a fort established by the French in 1754, at the confluence of the Allegheny and Monongahela rivers. It was later taken over by the British, and later the Americans, and developed ...
.
Given its strategic location at the Ohio, Fort Duquesne became an important focal point of the
French and Indian War
The French and Indian War, 1754 to 1763, was a colonial conflict in North America between Kingdom of Great Britain, Great Britain and Kingdom of France, France, along with their respective Native Americans in the United States, Native American ...
. The first British attempt to retake the fort, the
Braddock Expedition
The Braddock Expedition, also known as Braddock's Campaign or Braddock's Defeat, was a British Empire, British military expedition which attempted to capture Fort Duquesne from the French colonial empire, French in 1755 during the French and Ind ...
, failed miserably. In 1758 British forces under General
John Forbes recaptured the fort; he had it destroyed to prevent any use by the French. The British built a new, larger fort on the site, including a moat, and named it
Fort Pitt. The historic site has been preserved as Pittsburgh's
Point State Park.
Under their colonial charters, both Pennsylvania and
Virginia
Virginia, officially the Commonwealth of Virginia, is a U.S. state, state in the Southeastern United States, Southeastern and Mid-Atlantic (United States), Mid-Atlantic regions of the United States between the East Coast of the United States ...
claimed the region that is now Allegheny County. Pennsylvania administered most of the region as part of its
Westmoreland County. Virginia considered everything south of the
Ohio River
The Ohio River () is a river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing in a southwesterly direction from Pittsburgh, Pennsylvania, to its river mouth, mouth on the Mississippi Riv ...
and east of the
Allegheny River
The Allegheny River ( ; ; ) is a tributary of the Ohio River that is located in western Pennsylvania and New York (state), New York in the United States. It runs from its headwaters just below the middle of Pennsylvania's northern border, nor ...
to be part of its
Yohogania County, and governed it from
Fort Dunmore. In addition, parts of the county were located in the proposed British colony of
Vandalia and the proposed U.S. state of
Westsylvania
Westsylvania was a proposed state of the United States located in what is now West Virginia, southwestern Pennsylvania, and small parts of Kentucky, Maryland, and Virginia. First proposed early in the American Revolution, Westsylvania would hav ...
. The overlapping boundaries, multiple governments, and confused deed claims soon proved unworkable. Near the end of the American Revolutionary War, in 1780 Pennsylvania and Virginia agreed to extend the
Mason–Dixon line
The Mason–Dixon line, sometimes referred to as Mason and Dixon's Line, is a demarcation line separating four U.S. states: Pennsylvania, Maryland, Delaware and West Virginia. It was Surveying, surveyed between 1763 and 1767 by Charles Mason ...
westward. This region was assigned to Pennsylvania. From 1781 until 1788, much of what Virginia had claimed as part of Yohogania County was administered as a part of the newly created
Washington County, Pennsylvania
Washington County is a County (United States), county in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, United States. As of the 2020 United States census, 2020 census, the population was 209,349. Its county seat is Washington, Pe ...
.
Allegheny County was officially created on September 24, 1788, from parts of
Washington and
Westmoreland counties. It was formed to respond to pressure from the increase in settlers living in the area around Pittsburgh; this was designated as the
county seat
A county seat is an administrative center, seat of government, or capital city of a county or parish (administrative division), civil parish. The term is in use in five countries: Canada, China, Hungary, Romania, and the United States. An equiva ...
in 1791. The county originally extended north to the shores of
Lake Erie
Lake Erie ( ) is the fourth-largest lake by surface area of the five Great Lakes in North America and the eleventh-largest globally. It is the southernmost, shallowest, and smallest by volume of the Great Lakes and also has the shortest avera ...
; it was reduced to its current borders by 1800. As population increased in the territory, other counties were organized.
In the 1790s, the
United States federal government
The Federal Government of the United States of America (U.S. federal government or U.S. government) is the Federation#Federal governments, national government of the United States.
The U.S. federal government is composed of three distinct ...
imposed a
whiskey
Whisky or whiskey is a type of liquor made from Fermentation in food processing, fermented grain mashing, mash. Various grains (which may be Malting, malted) are used for different varieties, including barley, Maize, corn, rye, and wheat. Whisky ...
excise tax. Farmers who had depended on whiskey income refused to pay and started the so-called
Whiskey Rebellion
The Whiskey Rebellion (also known as the Whiskey Insurrection) was a violent tax protest in the United States beginning in 1791 and ending in 1794 during the presidency of George Washington. The so-called "whiskey tax" was the first tax impo ...
after driving off tax collector
John Neville. After a series of demonstrations by farmers, President
George Washington
George Washington (, 1799) was a Founding Fathers of the United States, Founding Father and the first president of the United States, serving from 1789 to 1797. As commander of the Continental Army, Washington led Patriot (American Revoluti ...
sent troops to suppress the frontier rebellion.
The area developed rapidly through the 1800s with industrialization. It became the nation's prime
steel
Steel is an alloy of iron and carbon that demonstrates improved mechanical properties compared to the pure form of iron. Due to steel's high Young's modulus, elastic modulus, Yield (engineering), yield strength, Fracture, fracture strength a ...
producer by the late 19th century and Pittsburgh was nicknamed "Steel Capital of the World".
In 1913, the county's 125th anniversary was celebrated with a week-long series of events. The final day, September 27, was marked by a steamboat parade of 30
paddle wheelers. They traveled from
Monongahela Wharf down the Ohio to the
Davis Island Dam. The boats in line were the ''Steel City'' (formerly the Pittsburgh and Cincinnati packet ''Virginia''), the flag ship; ''City of Parkersburg'', ''Charles Brown'', ''Alice Brown'', ''Exporter'', ''Sam Brown'', ''Boaz'', ''Raymond Horner'', ''Swan'', ''Sunshine'', ''
I. C. Woodward'', ''Cruiser'', ''Volunteer'', ''A. R. Budd'', ''J. C. Risher'', ''Clyde'', ''Rival'', ''Voyager'', ''Jim Brown'', ''Rover'', ''Charlie Clarke'', ''Robt. J. Jenkins'', ''Slipper'', ''Bertha'', ''Midland'' ''Sam Barnum'', ''Cadet'', ''Twilight'', and ''Troubadour''.
Geography
According to the
U.S. Census Bureau, the county has a total area of , of which is land and (1.9%) is water.
Four major rivers traverse Allegheny County: the
Allegheny River
The Allegheny River ( ; ; ) is a tributary of the Ohio River that is located in western Pennsylvania and New York (state), New York in the United States. It runs from its headwaters just below the middle of Pennsylvania's northern border, nor ...
and the
Monongahela River
The Monongahela River ( , ), sometimes referred to locally as the Mon (), is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed August 15, 2011 river on the Allegheny Plateau in nor ...
converge at
Downtown Pittsburgh
Downtown Pittsburgh, colloquially referred to as the Golden Triangle, and officially the Central Business District, is the urban downtown center of Pittsburgh, Pennsylvania, United States. It is located at the confluence of the Allegheny River an ...
to form the
Ohio River
The Ohio River () is a river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing in a southwesterly direction from Pittsburgh, Pennsylvania, to its river mouth, mouth on the Mississippi Riv ...
. The
Youghiogheny River
The Youghiogheny River ( ), or the Yough ( ) for short, is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed August 15, 2011 tributary of the Monongahela River in West Virginia, Maryla ...
flows into the Monongahela River at
McKeesport, to the southeast. There are several islands in these courses. The rivers drain via the
Mississippi River
The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...
into the
Gulf of Mexico
The Gulf of Mexico () is an oceanic basin and a marginal sea of the Atlantic Ocean, mostly surrounded by the North American continent. It is bounded on the northeast, north, and northwest by the Gulf Coast of the United States; on the southw ...
. Although the county's industrial growth resulted in
clearcutting
Clearcutting, clearfelling or clearcut logging is a forestry/logging practice in which most or all trees in an area are uniformly cut down. Along with Shelterwood cutting, shelterwood and Seed tree, seed tree harvests, it is used by foresters t ...
of the area's forests, a significant amount of woodland has regrown.
Adjacent counties
*
Butler County (north)
*
Armstrong County (northeast)
*
Westmoreland County (east and south)
*
Washington County (southwest)
*
Beaver County (northwest)
Major roads and highways
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Climate
Allegheny has a
humid continental climate
A humid continental climate is a climatic region defined by Russo-German climatologist Wladimir Köppen in 1900, typified by four distinct seasons and large seasonal temperature differences, with warm to hot (and often humid) summers, and cold ...
which is hot-summer, (''Dfa'') except in higher elevations, where it is warm-summer (''Dfb'').
Government and politics

Until January 1, 2000, Allegheny County's government was defined under Pennsylvania's Second Class County Code. The county government was charged with all local activities, including elections, prisons, airports, public health, and city planning. All public offices were headed by elected citizens. There were three elected county commissioners.
On January 1, 2000, the Home-Rule Charter went into effect. It replaced the three elected commissioners with an elected chief officer (the County Executive), a county council with 15 members (13 elected by district, two elected county-wide), and an appointed county manager. The changes were intended to maintain a separation of powers between the executive and legislative branches while providing greater citizen control.
The county has 130 self-governing municipalities, the most in the state. (
Luzerne is second with 76). The county has one Second Class City (Pittsburgh) and three Third Class Cities (
Clairton,
Duquesne, and
McKeesport).
A 2004 study found the county would be better served by consolidating the southeastern portion of the county (which includes many small communities with modest economies) into a large municipality ("Rivers City") with a combined population of approximately 250,000.
Government structure
Allegheny County has a Home Rule Charter form of government since 2000. The county has three branches: the executive, the legislative, and the judicial.
The executive branch consists of the County Executive, who is elected for a four-year term and serves as the chief executive officer of the county; and the County Manager, who is appointed by the County Executive and oversees the daily operations of the county departments.
The current County Executive is
Sara Innamorato, a Democrat who took office in 2024. The current County Manager is William D. McKain, who was appointed by Fitzgerald in 2012 and reappointed in 2016 and 2020.
The legislative branch consists of the County Council, which is composed of 15 members elected for four-year terms from 13 single-member districts and 2
At-Large
At large (''before a noun'': at-large) is a description for members of a governing body who are elected or appointed to represent a whole membership or population (notably a city, county, state, province, nation, club or association), rather tha ...
representatives, currently occupied by
Bethany Hallam and Sam DeMarco. The council functions as the primary legislative and policy-making body of the county.
The current County Council President is Patrick Catena, a Democrat who represents District 4 and was elected by his fellow council members in 2018 and 2020.
The judicial branch consists of the Court of Common Pleas, which is the general trial court of the county; and the Magisterial District Courts, which are lower courts that handle minor criminal and civil cases. The judges of these courts are elected for ten-year terms.
The current President Judge of the Court of Common Pleas is Kimberly Berkeley Clark, who was elected by her fellow judges in 2018 for a five-year term.
Self-governing municipalities
Allegheny County has 130 self-governing municipalities, the most in the state. These include one city (Pittsburgh), 96 boroughs, 30 townships, and two home rule municipalities (Bethel Park and McCandless).
Each municipality has its own elected officials, such as mayor, council, commissioners, supervisors, etc., and its own local services, such as police, fire, public works, etc.
Some municipalities also have their own municipal authorities that provide services such as water, sewer, transit, etc.
Changes to Administrative Divisions
There have been several proposals to consolidate or merge some of the municipalities in Allegheny County, either with each other or with the City of Pittsburgh, to reduce costs, improve efficiency, and enhance regional cooperation. However, none of these proposals have been implemented so far.
One of the most recent proposals is from
Wilkinsburg, a borough that borders Pittsburgh and faces financial challenges due to declining population and tax base. In 2020, Wilkinsburg residents voted to approve a referendum to explore a merger with Pittsburgh. In 2021, a joint task force was formed to study the feasibility and impact of such a merger. The task force is expected to issue a report by June 2022. If both Wilkinsburg and Pittsburgh councils approve the merger, it would then need approval from the state legislature and governor before taking effect.
Another recent proposal is from Allegheny County Economic Development (ACED), which is seeking to enter into an agreement with a consultant to carry out historic preservation compliance activities for projects funded by various federal programs. The consultant would help ACED develop a Programmatic Memorandum of Agreement (PMOA) with the Pennsylvania State Historic Preservation Office (SHPO) and other stakeholders to streamline the review process for projects that may affect historic properties within the county. ACED issued a Request for Proposals (RFP) for this service in January 2022 and expects to select a consultant by March 2022.
County Executive
*
Sara Innamorato (D)
County Council
*
Bethany Hallam (D), At-large Member
* Mike Embrescia (R), At-large Member
* Jack Betkowski (D), District 1
* Suzanne Filiaggi (R), District 2
* Anita Prizio (D), District 3
* Patrick Catena (D), President, District 4
* Dan Grzybek (D), District 5
* John F. Palmiere (D), Vice President, District 6
* Nicholas Futules (D), District 7
* Michelle Naccarati-Chapkis (D), District 8
* Robert J. Macey (D), District 9
* DeWitt Walton (D), District 10,
* Paul Klein (D), District 11
* Robert Palmosina (D), District 12
* Jordan Botta (D), District 13
Other elected county offices
* Controller,
Corey O'Connor (D)
* District Attorney,
Stephen A. Zappala Jr. (
Forward)
* Sheriff, Kevin M. Kraus (D)
* Treasurer, Erica Rocchi Brusselars (D)
Voter Registration
there were 908,024 registered voters in the county; a majority were Democrats. There were 499,711 registered
Democrats, 264,342 registered
Republicans, 106,334 registered as
independents and 37,637 registered with
other parties.
Political history
The
Republican Party had been historically dominant in county-level politics in the 19th and early 20th centuries; prior to the
Great Depression
The Great Depression was a severe global economic downturn from 1929 to 1939. The period was characterized by high rates of unemployment and poverty, drastic reductions in industrial production and international trade, and widespread bank and ...
, Pittsburgh and Allegheny County had been majority Republican. Since the Great Depression on the state and national levels, the
Democratic Party has been dominant in county-level politics. It is by far the most Democratic county in western Pennsylvania. For much of the time between the Great Depression and the turn of the millennium, it was the second-strongest Democratic bastion in Pennsylvania, behind only Philadelphia.
In 2000, Democrat
Al Gore
Albert Arnold Gore Jr. (born March 31, 1948) is an American former politician, businessman, and environmentalist who served as the 45th vice president of the United States from 1993 to 2001 under President Bill Clinton. He previously served as ...
won 56% of the vote and Republican
George W. Bush
George Walker Bush (born July 6, 1946) is an American politician and businessman who was the 43rd president of the United States from 2001 to 2009. A member of the Bush family and the Republican Party (United States), Republican Party, he i ...
won 41%. In 2004, Democrat
John Kerry
John Forbes Kerry (born December 11, 1943) is an American attorney, politician, and diplomat who served as the 68th United States secretary of state from 2013 to 2017 in the Presidency of Barack Obama#Administration, administration of Barac ...
received 57% of the vote and Republican Bush received 41%. In 2006, Democrats Governor
Ed Rendell and Senator
Bob Casey Jr. won 59% and 65% of the vote in Allegheny County, respectively. In 2008, Democrat
Barack Obama
Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president in American history. O ...
received 57% of the vote, Republican
John McCain
John Sidney McCain III (August 29, 1936 – August 25, 2018) was an American statesman and United States Navy, naval officer who represented the Arizona, state of Arizona in United States Congress, Congress for over 35 years, first as ...
received 41%, and each of the three state row office winners (
Rob McCord for Treasurer,
Jack Wagner for Auditor General, and
Tom Corbett for Attorney General) also carried Allegheny. In 2016, despite
Donald Trump
Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...
being the first Republican to carry Pennsylvania since 1988,
Hillary Clinton
Hillary Diane Rodham Clinton ( Rodham; born October 26, 1947) is an American politician, lawyer and diplomat. She was the 67th United States secretary of state in the administration of Barack Obama from 2009 to 2013, a U.S. senator represent ...
did slightly better than Barack Obama's 2012 vote total while Donald Trump was the worst performing Republican in 20 years. In the
2018 Midterms, Democrats received an even higher percentage of the vote with
Tom Wolf
Thomas Westerman Wolf (born November 17, 1948) is an American politician and businessman who served as the 47th governor of Pennsylvania from 2015 to 2023. He previously served as chairman and CEO of his business, The Wolf Organization, and l ...
and Casey receiving approximately two thirds of the county's vote. This is an improvement over the approximately 55% each person received in the county in their last election in 2014 and 2012 respectively. In 2020, Joe Biden improved upon Clinton's performance, receiving the highest vote percentage for a Democrat since
Michael Dukakis
Michael Stanley Dukakis ( ; born November 3, 1933) is an American politician and lawyer who served as governor of Massachusetts from 1975 to 1979 and from 1983 to 1991. He is the longest-serving governor in Massachusetts history and only the s ...
in 1988 and the most votes for a Democrat since
Lyndon B. Johnson
Lyndon Baines Johnson (; August 27, 1908January 22, 1973), also known as LBJ, was the 36th president of the United States, serving from 1963 to 1969. He became president after the assassination of John F. Kennedy, under whom he had served a ...
in 1964.
In the 21st century, populist turns to the GOP from nearly all of Appalachia in general and western Pennsylvania in particular have left the county as one of the few in the region that still supports the Democrats at a high level.
State representatives
Source
*
Aerion Abney, Democratic, 19th district
*
Emily Kinkead, Democratic, 20th district
*
Lindsay Powell, Democratic, 21st district
*
Dan Frankel, Democratic, 23rd district
*
La'Tasha Mayes, Democratic, 24th district
*
Brandon Markosek, Democratic, 25th district
*
Daniel J. Deasy, Democratic, 27th district
*
Rob Mercuri, Republican, 28th district
*
Arvind Venkat, Democratic, 30th district
*
Joe McAndrew, Democratic, 32nd district
*
Mandy Steele, Democratic, 33rd district
*
Abigail Salisbury, Democratic, 34th district
*
Matt Gergely, Democratic, 35th district
*
Jessica Benham, Democratic, 36th district
*
Nick Pisciottano, Democratic, 38th district
*
Andrew Kuzma, Republican, 39th district
*
Natalie Mihalek, Republican, 40th district
*
Dan L. Miller, Democratic, 42nd district
*
Valerie Gaydos, Republican, 44th district
*
Anita Astorino Kulik, Democratic, 45th district
*
Jason Ortitay, Republican, 46th district
State senators
*
Devlin Robinson, Republican, 37th district
*
Lindsey Williams, Democrat, 38th district
*
Wayne D. Fontana, Democrat, 42nd district
*
Jay Costa, Democrat, 43rd district
*
James Brewster, Democrat, 45th district
U.S. representatives
*
Chris Deluzio
Christopher Raphael Deluzio (born July 13, 1984) is an American politician, attorney, and former U.S. Navy officer serving as the U.S. representative for Pennsylvania's 17th congressional district since 2023. A member of the Democratic Party, ...
, Democrat, 17th district
*
Summer Lee, Democrat, 12th district
U.S. senators
*
John Fetterman, Democrat
*
Dave McCormick
David Harold McCormick (born August 17, 1965) is an American politician, businessman, and former United States Army, Army officer serving since 2025 as the Seniority in the United States Senate, junior United States Senate, United States senato ...
, Republican
United States Senate
*
John Fetterman,
Democratic
*
Dave McCormick
David Harold McCormick (born August 17, 1965) is an American politician, businessman, and former United States Army, Army officer serving since 2025 as the Seniority in the United States Senate, junior United States Senate, United States senato ...
,
Republican
Religion
In 2010 statistics, the largest religious group in Allegheny County was the
Roman Catholic Diocese of Pittsburgh
The Diocese of Pittsburgh () is a Latin Church ecclesiastical jurisdiction, or diocese, of the Catholic Church in Western Pennsylvania in the United States. It was established on August 11, 1843. The diocese is a suffragan diocese of the Archdi ...
, with 460,672 Catholics worshipping at 179 parishes; followed by the
United Methodist Church
The United Methodist Church (UMC) is a worldwide mainline Protestant Christian denomination, denomination based in the United States, and a major part of Methodism. In the 19th century, its main predecessor, the Methodist Episcopal Church, was ...
, with 44,204 Methodists in 100 congregations; the
Presbyterian Church in the United States of America
The Presbyterian Church in the United States of America (PCUSA) was a Presbyterian denomination existing from 1789 to 1958. In that year, the PCUSA merged with the United Presbyterian Church of North America. The new church was named the United ...
, with 42,838 Presbyterians in 145 congregations;
non-denominational
A non-denominational person or organization is one that does not follow (or is not restricted to) any particular or specific religious denomination.
The term has been used in the context of various faiths, including Jainism, Baháʼí Faith, Zoro ...
Protestants, with 33,103 adherents in 85 congregations; the
Evangelical Lutheran Church in America
The Evangelical Lutheran Church in America (ELCA) is a mainline Protestant church headquartered in Chicago, Illinois. The ELCA was officially formed on January 1, 1988, by the merging of three Lutheran church bodies. As of December 31, 2023, it ...
, with 24,718 Lutherans in 77 congregations; the
American Baptist Churches USA
The American Baptist Churches USA (ABCUSA) is a mainline Protestant and Baptist Christian denomination. It is a reorganization from 1907 of the Triennial Convention. The Triennial Convention was renamed as the Northern Baptist Convention in ...
, with 17,148 Baptists in 42 congregations; the
Assemblies of God
The World Assemblies of God Fellowship (WAGF), commonly known as the Assemblies of God (AG), is a global cooperative body or communion of over 170 Pentecostal denominations that was established on August 15, 1989. The WAGF was created to provi ...
, with 12,398 Pentecostals in 30 congregations;
Reform Judaism
Reform Judaism, also known as Liberal Judaism or Progressive Judaism, is a major Jewish religious movements, Jewish denomination that emphasizes the evolving nature of Judaism, the superiority of its Jewish ethics, ethical aspects to its ceremo ...
, with 8,483 Jews in 6 congregations; the 7,780
Episcopal Church (United States)
The Episcopal Church (TEC), also known as the Protestant Episcopal Church in the United States of America (PECUSA), is a member of the worldwide Anglican Communion, based in the United States. It is a mainline Protestant denomination and is ...
, with 7,780 Episcopalians in 19 congregations; and
Hinduism in the United States
Hinduism in the United States of America, United States is a religious denomination comprising around 1% of the population, nearly the same as Buddhism in the United States, Buddhism and Islam in the United States, Islam. Hindu Americans in the ...
, with 6,700 Hindus in four
temples
A temple (from the Latin ) is a place of worship, a building used for spiritual rituals and activities such as prayer and sacrifice. By convention, the specially built places of worship of some religions are commonly called "temples" in Engli ...
. Altogether, 60.6% of the population was claimed as members by religious congregations, although members of historically African-American denominations were underrepresented due to incomplete information. In 2014, Allegheny County had 794 religious organizations, the 11th most out of all US counties.
Demographics
As of the
2010 census, there were 1,223,348 people living in the county. The population density was . The racial makeup of the county was 82.87% White, 14.39% Black or African American, 2.94% Asian, 0.03% Pacific Islander, 0.37% from other races, and 1.40% from two or more races. About 1.31% of the population were Hispanic or Latino of any race.
At the
2000 census, there were 1,281,666 people, 537,150 households, and 332,495 families living in the county. The population density was . There were 583,646 housing units at an average density of . The racial makeup of the county was 84.33% White, 12.41% Black or African American, 0.12% Native American, 1.69% Asian, 0.03% Pacific Islander, 0.34% from other races, and 1.07% from two or more races. About 0.87% of the population were Hispanic or Latino of any race. 20.0% were of
German, 15.0%
Italian
Italian(s) may refer to:
* Anything of, from, or related to the people of Italy over the centuries
** Italians, a Romance ethnic group related to or simply a citizen of the Italian Republic or Italian Kingdom
** Italian language, a Romance languag ...
, 12.7%
Irish, 7.5%
Polish and 5.1% English ancestry. 93.5% spoke English and 1.3% Spanish as their first language.
There were 537,150 households, out of which 26.40% had children under the age of 18 living with them, 46.10% were married couples living together, 12.40% had a female householder with no husband present, and 38.10% were non-families. Some 32.70% of all households were made up of individuals, and 13.20% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.96.
The age distribution of the population shows 21.90% under the age of 18, 8.50% from 18 to 24, 28.30% from 25 to 44, 23.40% from 45 to 64, and 17.80% who were 65 years of age or older. The median age was 40. For every 100 females, there were 90.00 males; for every 100 females age 18 and over, there were 86.20 males.
2020 census
Economy
In the late 18th century,
farming
Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created ...
played a critical role in the growth of the area. There was a surplus of grain due to transportation difficulties in linking with the eastern portion of the state. As a result, the farmers distilled the grain into
whiskey
Whisky or whiskey is a type of liquor made from Fermentation in food processing, fermented grain mashing, mash. Various grains (which may be Malting, malted) are used for different varieties, including barley, Maize, corn, rye, and wheat. Whisky ...
, which significantly helped the farmers financially.
The area quickly became a key manufacturing area in the young nation. Coupled with deposits of iron and coal, and the easy access to waterways for
barge
A barge is typically a flat-bottomed boat, flat-bottomed vessel which does not have its own means of mechanical propulsion. Original use was on inland waterways, while modern use is on both inland and ocean, marine water environments. The firs ...
traffic, the city quickly became one of the most important steel producing areas in the world. Based on 2007 data from the US Army Corps of Engineers, Pittsburgh is the second (after
Laredo, Texas
Laredo ( ; ) is a city in the U.S. state of Texas and the county seat of Webb County, Texas, Webb County, on the north bank of the Rio Grande in South Texas, across from Nuevo Laredo, Tamaulipas, Mexico. Founded in 1755, Laredo grew from a villag ...
) busiest inland port in the nation.
US steel production declined late in the 20th century, and Allegheny County's economy began a shift to other industries. It is presently known for its hospitals, universities, and industrial centers. Despite the decline of
heavy industry
Heavy industry is an industry that involves one or more characteristics such as large and heavy products; large and heavy equipment and facilities (such as heavy equipment, large machine tools, huge buildings and large-scale infrastructure); o ...
, Pittsburgh is home to a number of major companies and is ranked in th
top tenamong US cities hosting headquarters of Fortune 500 corporations, including
U.S. Steel Corporation,
PNC Financial Services
The PNC Financial Services Group, Inc. is an American bank holding company and financial services corporation based in Pittsburgh, Pennsylvania. Its banking subsidiary, PNC Bank, operates in 27 states and the District of Columbia, with 2,629 ...
Group,
PPG Industries
PPG Industries, Inc. is an American Fortune 500, ''Fortune'' 500 company and global supplier of paints, coatings, and specialty materials. With headquarters in Pittsburgh, Pennsylvania, PPG operates in more than 70 countries around the globe. By ...
, and
H. J. Heinz Company.
The county leads the state in number of
defense contractors supplying the U.S. military.
Regions
*
East Hills
*
North Hills
*
South Hills
*
West Hills
*
City of Pittsburgh
Education
Colleges and universities
*
Byzantine Catholic Seminary of SS. Cyril and Methodius
*
Carlow University
*
Carnegie Mellon University
Carnegie Mellon University (CMU) is a private research university in Pittsburgh, Pennsylvania, United States. The institution was established in 1900 by Andrew Carnegie as the Carnegie Technical Schools. In 1912, it became the Carnegie Institu ...
*
Chatham University
*
DeVry University
*
Duquesne University
Duquesne University of the Holy Spirit ( ; also known as Duquesne University or Duquesne) is a Private university, private Catholic higher education, Catholic research university in Pittsburgh, Pennsylvania, United States. Founded by members of ...
*
La Roche University
*
Penn State Greater Allegheny
*
Pittsburgh Theological Seminary
*
Point Park University
Point Park University is a private university in Pittsburgh, Pennsylvania. Formerly known as Point Park College, the school name was revised in 2004 to reflect the number of graduate programs being offered. In 2021, it had a total undergraduate ...
*
Reformed Presbyterian Theological Seminary
The Reformed Presbyterian Theological Seminary (RPTS) is a Reformed Presbyterian seminary in Point Breeze, Pennsylvania. RPTS is a ministry of the Reformed Presbyterian Church of North America and was founded in 1810, making it the fifth old ...
*
Robert Morris University
Robert Morris University (RMU) is a private university in Moon Township, Pennsylvania, United States. It was founded in 1921 and is named after Robert Morris (financier), Robert Morris, known as the "financier of the American Revolution". It enr ...
*
University of Pittsburgh
The University of Pittsburgh (Pitt) is a Commonwealth System of Higher Education, state-related research university in Pittsburgh, Pennsylvania, United States. The university is composed of seventeen undergraduate and graduate schools and colle ...
Community, junior and technical colleges
* Bidwell Training Center
*
Community College of Allegheny County
*
Empire Beauty Schools
*
Fountain of Youth Academy of Cosmetology
*
Institute of Medical and Business Careers
*
North Hills Beauty Academy
*
Pittsburgh Career Institute
*
Pittsburgh Institute of Aeronautics
*
Pittsburgh Institute of Mortuary Science
*
Pittsburgh Multicultural Cosmetology Academy
*
Pittsburgh Technical College
*
Rosedale Technical College
*
South Hills Beauty Academy
*
Triangle Tech
* Vet Tech Institute
Public school districts

School districts include:
Approved private schools
These private schools provide special education for disabled students:
* ACLD Tillotson School, Pittsburgh
* The Day School at The Children's Institute, Pittsburgh
* DePaul School for Hearing and Speech, Pittsburgh
* Easter Seal Society of Western Pennsylvania
* The Education Center at the Watson Institute, Sewickley
* Pace School, Pittsburgh
* Pressley Ridge Day School, Pittsburgh
* Pressley Ridge School for the Deaf, Pittsburgh
* The Watson Institute Friendship Academy, Pittsburgh
* Wesley Spectrum Highland Services, Pittsburgh
*
Western Pennsylvania School for Blind Children, Pittsburgh
*
Western Pennsylvania School for the Deaf, Pittsburgh
Private high schools
*
Bishop Canevin High School
*
Central Catholic High School
*
Cornerstone Christian Preparatory Academy
* Eden Christian Academy
*
The Ellis School
The Ellis School is an independent, all-girls, college-preparatory school located in the Shadyside section in the east end of Pittsburgh, Pennsylvania. The school serves girls aged 3 to grade 12.
History
20th century
When Pittsburgh's P ...
* Hillcrest Christian Academy
* Harvest Baptist Academy
* Imani Christian Academy
*
Oakland Catholic High School
*
Our Lady of the Sacred Heart High School
*
Serra Catholic High School
*
Seton-La Salle Catholic High School
Seton LaSalle Catholic High School is a private, Roman Catholic high school in Mt. Lebanon, Pennsylvania, a suburb of Pittsburgh, Pennsylvania. It is located in the Roman Catholic Diocese of Pittsburgh.
In 2016, Seton LaSalle simplified the f ...
*
Sewickley Academy
*
Shady Side Academy
*
St. Joseph High School
*
Vincentian Academy
*
Winchester Thurston School
Transportation
Allegheny County's
public transportation
Public transport (also known as public transit, mass transit, or simply transit) are forms of transport available to the general public. It typically uses a fixed schedule, route and charges a fixed fare. There is no rigid definition of whi ...
provider is
Pittsburgh Regional Transit
Pittsburgh Regional Transit (PRT) is the public agency responsible for most public transportation services in the Greater Pittsburgh region in Pennsylvania. It is the second-largest public transit agency in Pennsylvania and the 20th-largest in ...
. The
Allegheny County Department of Public Works oversees infrastructure, maintenance, and engineering services in the county.
The
Three Rivers Heritage Trail provides uninterrupted bicycle and pedestrian connections along the three rivers in the city, and the
Great Allegheny Passage trail runs from downtown Pittsburgh to Washington, D.C.
The
Allegheny County Airport is the original airport for Pittsburgh and houses a number of flight schools, charter flight operations, and medevac operations. It is owned and operated by The Allegheny County Airport Authority.
Pittsburgh International Airport is the major passenger airport for the county with service to many destinations on several airlines. Like the Allegheny County Airport, it is also owned and operated by The Allegheny County Airport Authority.
Major roadways
*
Interstate 79 runs north to south from
Warrendale to
Bridgeville
*
Interstate 279 runs north to south from
Franklin Park to Downtown
*
Interstate 579 (Crosstown Boulevard), from
Interstate 279 on the north shore to
Liberty Bridge /
Boulevard of the Allies
*
Interstate 76 /
PA Turnpike runs east to west from
Interstate 376 in
Monroeville to the
Warrendale interchange (at
Interstate 79)
*
Interstate 376 runs east to west from
Interstate 76 in
Monroeville across the county to
Pittsburgh International Airport and beyond
*
Pennsylvania Turnpike 576 (future I-576) runs south from
Interstate 376 at the
Pittsburgh International Airport to
US Route 22, also called the Findlay Connector. The next phase of this road extension, from
US Route 22 to
Interstate 79 running along the County line, is currently under construction and is expected to be open to traffic in 2020.
*
US Route 19 runs north to south from
Warrendale to
Upper St. Clair
*
US Route 22 runs west to east, along much of
US Route 30 and
Interstate 376, from
Imperial to
Monroeville
*
US Route 30 runs west to east from
Clinton to
North Versailles, joining
US 22 and
Interstate 376 south of the
Pittsburgh International Airport and leaving those same two routes in
Wilkinsburg
For information about major state roads, see
list of state routes in Allegheny County, Pennsylvania and
Allegheny County Belt System.
Parks and recreation
There are two
Pennsylvania state parks in Allegheny County.
Point State Park is at the
confluence
In geography, a confluence (also ''conflux'') occurs where two or more watercourses join to form a single channel (geography), channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main ...
of the Allegheny and Monongahela rivers in
Downtown Pittsburgh
Downtown Pittsburgh, colloquially referred to as the Golden Triangle, and officially the Central Business District, is the urban downtown center of Pittsburgh, Pennsylvania, United States. It is located at the confluence of the Allegheny River an ...
, and
Allegheny Islands State Park is in the
Allegheny River
The Allegheny River ( ; ; ) is a tributary of the Ohio River that is located in western Pennsylvania and New York (state), New York in the United States. It runs from its headwaters just below the middle of Pennsylvania's northern border, nor ...
in
Harmar Township and is undeveloped as of August 2010.
Pennsylvania State Game Lands Number 203 is also located in Allegheny County providing hunting and other activities.
Allegheny Land Trust, a regional land conservation group headquartered in
Sewickley, has purchased land in Allegheny County for use as public green spaces for scenic and recreational purposes. In 2012 it pursued land formerly owned by the Pittsburgh Cut Flower Company in
Richland Township. In 2020, it received a grant to convert a former country club into a public green space. In December 2020, it donated 20 undeveloped acres across three parcels in
Hampton to expand
North Park.
Sports
*
Pittsburgh Steelers
The Pittsburgh Steelers are a professional American football team based in Pittsburgh. The Steelers compete in the National Football League (NFL) as a member of the American Football Conference (AFC) AFC North, North division. Founded in 1933 P ...
,
football
Football is a family of team sports that involve, to varying degrees, kick (football), kicking a football (ball), ball to score a goal (sports), goal. Unqualified, football (word), the word ''football'' generally means the form of football t ...
team
*
Pittsburgh Penguins
The Pittsburgh Penguins (colloquially known as the Pens) are a professional ice hockey team based in Pittsburgh. The Penguins compete in the National Hockey League (NHL) as a member of the Metropolitan Division in the Eastern Conference (NHL), E ...
,
ice hockey
Ice hockey (or simply hockey in North America) is a team sport played on ice skates, usually on an Ice rink, ice skating rink with Ice hockey rink, lines and markings specific to the sport. It belongs to a family of sports called hockey. Tw ...
team
*
Pittsburgh Pirates
The Pittsburgh Pirates are an American professional baseball team based in Pittsburgh. The Pirates compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League Central, Central ...
,
baseball
Baseball is a bat-and-ball games, bat-and-ball sport played between two team sport, teams of nine players each, taking turns batting (baseball), batting and Fielding (baseball), fielding. The game occurs over the course of several Pitch ...
team
*
Pittsburgh Riverhounds,
soccer
Association football, more commonly known as football or soccer, is a team sport played between two teams of 11 Football player, players who almost exclusively use their feet to propel a Ball (association football), ball around a rectangular f ...
team
*
Pittsburgh Passion,
Women's Football Alliance team
*
Pittsburgh Thunderbirds,
American Ultimate Disc League team
*
Steel City Roller Derby,
Women's Flat Track Derby Association team
Communities

Under Pennsylvania law, there are four types of incorporated municipalities:
cities
A city is a human settlement of a substantial size. The term "city" has different meanings around the world and in some places the settlement can be very small. Even where the term is limited to larger settlements, there is no universally agree ...
,
boroughs
A borough is an administrative division in various English language, English-speaking countries. In principle, the term ''borough'' designates a self-governing walled town, although in practice, official use of the term varies widely.
History
...
,
townships, and (in a case) a
town
A town is a type of a human settlement, generally larger than a village but smaller than a city.
The criteria for distinguishing a town vary globally, often depending on factors such as population size, economic character, administrative stat ...
. The following municipalities are in Allegheny County:
Cities
*
Clairton
*
Duquesne
*
McKeesport
*
Pittsburgh
Pittsburgh ( ) is a city in Allegheny County, Pennsylvania, United States, and its county seat. It is the List of municipalities in Pennsylvania#Municipalities, second-most populous city in Pennsylvania (after Philadelphia) and the List of Un ...
(county seat)
Boroughs
*
Aspinwall
*
Avalon
*
Baldwin
*
Bell Acres
*
Bellevue
*
Ben Avon
*
Ben Avon Heights
*
Bethel Park
*
Blawnox
*
Brackenridge
*
Braddock
*
Braddock Hills
*
Bradford Woods
*
Brentwood
*
Bridgeville
*
Carnegie
*
Castle Shannon
*
Chalfant
*
Cheswick
*
Churchill
*
Coraopolis
*
Crafton
*
Dormont
*
Dravosburg
*
East McKeesport
*
East Pittsburgh
*
Edgewood
*
Edgeworth
*
Elizabeth
*
Emsworth
*
Etna
*
Forest Hills
*
Fox Chapel
*
Franklin Park
*
Glassport
*
Glenfield
*
Glen Osborne
*
Green Tree
*
Haysville
*
Heidelberg
Heidelberg (; ; ) is the List of cities in Baden-Württemberg by population, fifth-largest city in the States of Germany, German state of Baden-Württemberg, and with a population of about 163,000, of which roughly a quarter consists of studen ...
*
Homestead
*
Ingram
*
Jefferson Hills
*
Leetsdale
*
Liberty
Liberty is the state of being free within society from oppressive restrictions imposed by authority on one's way of life, behavior, or political views. The concept of liberty can vary depending on perspective and context. In the Constitutional ...
*
Lincoln
*
McDonald (mostly in
Washington County)
*
McKees Rocks
*
Millvale
*
Monroeville
*
Mount Oliver
*
Munhall
*
North Braddock
*
Oakdale
*
Oakmont
*
Pennsbury Village
*
Pitcairn
*
Pleasant Hills
*
Plum
A plum is a fruit of some species in Prunus subg. Prunus, ''Prunus'' subg. ''Prunus'.'' Dried plums are often called prunes, though in the United States they may be labeled as 'dried plums', especially during the 21st century.
Plums are ...
*
Port Vue
*
Rankin
*
Rosslyn Farms
*
Sewickley
*
Sewickley Heights
*
Sewickley Hills
*
Sharpsburg
*
Springdale
*
Swissvale
*
Tarentum
*
Thornburg
*
Trafford
Trafford is a metropolitan borough of Greater Manchester, England, with an estimated population of in . It covers and includes the area of Old Trafford (area), Old Trafford and the towns of Altrincham, Stretford, Urmston, Partington and Sa ...
(mostly in
Westmoreland County)
*
Turtle Creek
*
Verona
Verona ( ; ; or ) is a city on the Adige, River Adige in Veneto, Italy, with 255,131 inhabitants. It is one of the seven provincial capitals of the region, and is the largest city Comune, municipality in the region and in Northeast Italy, nor ...
*
Versailles
The Palace of Versailles ( ; ) is a former royal residence commissioned by King Louis XIV located in Versailles, Yvelines, Versailles, about west of Paris, in the Yvelines, Yvelines Department of Île-de-France, Île-de-France region in Franc ...
*
Wall
A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or serves a decorative purpose. There are various types of walls, including border barriers between countries, brick wal ...
*
West Elizabeth
*
West Homestead
*
West Mifflin
*
West View
*
Whitaker
*
White Oak
''Quercus'' subgenus ''Quercus'' is one of the two subgenera into which the genus ''Quercus'' was divided in a 2017 classification (the other being subgenus ''Cerris''). It contains about 190 species divided among five sections. It may be calle ...
*
Whitehall
Whitehall is a road and area in the City of Westminster, Central London, England. The road forms the first part of the A roads in Zone 3 of the Great Britain numbering scheme, A3212 road from Trafalgar Square to Chelsea, London, Chelsea. It ...
*
Wilkinsburg
*
Wilmerding
Townships
*
Aleppo
Aleppo is a city in Syria, which serves as the capital of the Aleppo Governorate, the most populous Governorates of Syria, governorate of Syria. With an estimated population of 2,098,000 residents it is Syria's largest city by urban area, and ...
* Baldwin Township, Pennsylvania, Baldwin
* Collier Township, Pennsylvania, Collier
* Crescent Township, Pennsylvania, Crescent
* East Deer Township, Pennsylvania, East Deer
* Elizabeth Township, Allegheny County, Pennsylvania, Elizabeth
* Fawn Township, Allegheny County, Pennsylvania, Fawn
* Findlay Township, Pennsylvania, Findlay
* Forward Township, Allegheny County, Pennsylvania, Forward
* Frazer Township, Allegheny County, Pennsylvania, Frazer
* Hampton Township, Allegheny County, Pennsylvania, Hampton
* Harmar Township, Allegheny County, Pennsylvania, Harmar
* Harrison Township, Allegheny County, Pennsylvania, Harrison
* Indiana Township, Allegheny County, Pennsylvania, Indiana
* Kennedy Township, Allegheny County, Pennsylvania, Kennedy
* Kilbuck Township, Allegheny County, Pennsylvania, Kilbuck
* Leet Township, Allegheny County, Pennsylvania, Leet
* Marshall Township, Pennsylvania, Marshall
* McCandless Township, Allegheny County, Pennsylvania, McCandless
* Moon Township, Pennsylvania, Moon
* Mt. Lebanon Township, Allegheny County, Pennsylvania, Mt. Lebanon
* Neville Township, Pennsylvania, Neville
* North Fayette Township, Pennsylvania, North Fayette
*
North Versailles
* O'Hara Township, Pennsylvania, O'Hara
* Ohio Township, Pennsylvania, Ohio
* Penn Hills Township, Allegheny County, Pennsylvania, Penn Hills
* Pine Township, Allegheny County, Pennsylvania, Pine
* Reserve Township, Pennsylvania, Reserve
* Richland Township, Allegheny County, Pennsylvania, Richland
* Robinson Township, Allegheny County, Pennsylvania, Robinson
* Ross Township, Allegheny County, Pennsylvania, Ross
* Scott Township, Allegheny County, Pennsylvania, Scott
* Shaler Township, Pennsylvania, Shaler
* South Fayette Township, Pennsylvania, South Fayette
* South Park Township, Pennsylvania, South Park
* South Versailles Township, Pennsylvania, South Versailles
* Springdale Township, Pennsylvania, Springdale
* Stowe Township, Pennsylvania, Stowe
* Upper St. Clair Township, Pennsylvania, Upper Saint Clair
* West Deer Township, Pennsylvania, West Deer
* Wilkins Township, Pennsylvania, Wilkins
Census-designated places
Census-designated places are geographical areas designated by the United States Census Bureau, US Census Bureau for the purposes of compiling demographic data. They are not actual jurisdictions under Pennsylvania law. Other unincorporated communities, such as villages, may be listed here as well.
* Allison Park, Pennsylvania, Allison Park
* Bairdford, Pennsylvania, Bairdford
* Bakerstown, Pennsylvania, Bakerstown
* Boston, Pennsylvania, Boston
* Carnot-Moon, Pennsylvania, Carnot-Moon
*
Clinton
* Curtisville, Pennsylvania, Curtisville
* Enlow, Pennsylvania, Enlow
* Gibsonia, Pennsylvania, Gibsonia
* Glenshaw, Pennsylvania, Glenshaw
* Greenock, Pennsylvania, Greenock
* Harwick, Pennsylvania, Harwick
*
Imperial
* Noblestown, Pennsylvania, Noblestown
* Rennerdale, Pennsylvania, Rennerdale
* Russellton, Pennsylvania, Russellton
* Sturgeon, Pennsylvania, Sturgeon
Unincorporated communities
* Acmetonia, Pennsylvania, Acmetonia
* Blackridge, Pennsylvania, Blackridge
* Blanchard, Allegheny County, Pennsylvania, Blanchard
* Broughton, Pennsylvania, Broughton
* Bruceton, Pennsylvania, Bruceton
* Buena Vista, Pennsylvania, Buena Vista
* Creighton, Pennsylvania, Creighton
* Cubbage Hill, Pennsylvania, Cubbage Hill
* Cuddy, Pennsylvania, Cuddy
* Dorseyville, Pennsylvania, Dorseyville
* Ewingsville, Pennsylvania, Ewingsville
[
* Harmarville, Pennsylvania, Harmarville
* Indianola, Pennsylvania, Indianola
* Ingomar, Pennsylvania, Ingomar
* Karns, Pennsylvania, Karns
* Keown Station, Pennsylvania, Keown Station
* Kirwan Heights, Pennsylvania, Kirwan Heights][
* Library, Pennsylvania, Library
* McKnight, Pennsylvania, McKnight
* Moon Run, Pennsylvania, Moon Run
* Mount Vernon, Pennsylvania, Mount Vernon
* Natrona, Pennsylvania, Natrona
* Natrona Heights, Pennsylvania, Natrona Heights
* Nevillewood, Pennsylvania, Nevillewood][
* Presto, Pennsylvania, Presto][
* Regent Square (Pittsburgh), Regent Square
* Rural Ridge, Pennsylvania, Rural Ridge
* Sheraden, Pennsylvania, Sheraden
* Warrendale
* Wexford, Pennsylvania, Wexford
* Wildwood, Pennsylvania, Wildwood
]
Former places
Many political subdivisions of Allegheny County have come and gone through subdivision or annexation through the years. These include:
* Allegheny, Pennsylvania, Allegheny City – the area that is now the North Shore (or North Side) of the City of Pittsburgh, north of the Allegheny River.
* Allentown Borough – now the neighborhood of Allentown in Pittsburgh.
* Birmingham, Allegheny County, Pennsylvania, Birmingham Borough – what is now Pittsburgh's South Side.
* Brushton Borough
* Carrick Borough – now the neighborhood of Carrick. Formed out of Baldwin Township in 1904, this borough existed until it was annexed by Pittsburgh in 1927. It was named for Carrick-on-Suir, Ireland. Some of the area's manhole covers still bear the Carrick Borough name.
* Chartier Township – existed at the time of the 1860 U.S. Federal Census.
* Collins Township, Allegheny County, Pennsylvania, Collins Township – in what is now the northeast part of the City of Pittsburgh, east of Lawrenceville and north of Penn Avenue.
* Knoxville Borough
* Lawrenceville Borough
* McClure Township, Allegheny County, Pennsylvania, McClure Township – McClure was formed in 1858 from the section of Ross Township adjacent to Allegheny City. In 1867 McClure, along with sections of Reserve Township, was incorporated into Allegheny City. The McClure section of this annexation became Wards 9 (Woods Run Area) and 11 (present-day Brighton Heights) in the City of Pittsburgh.
* Mifflin Township- comprised the modern day communities of Whitaker, West Mifflin, West Homestead, West Elizabeth, Pleasant Hills, Munhall, Lincoln Place, Jefferson Hills, Homestead, Hays, Duquesne, Dravosburg, Clairton and part of Baldwin.
* Patton Township – was in the east-central part of the county, north of North Versailles Township, east of Wilkins and Penn Townships, and south of Plum Township. In the U.S. census for 1860–1880. In 1951 it became incorporated as the borough of Monroeville.
* Northern Liberties Borough – in what is now the Strip District, Pittsburgh, Strip District of Pittsburgh. The borough was annexed to Pittsburgh in 1837 as the first addition to the city's original territory.
* Peebles Township, Allegheny County, Pennsylvania, Peebles Township – included most of what is now the eastern part of the city of Pittsburgh from the Monongahela River in the south (today's Hazelwood (Pittsburgh), Hazelwood) to the Allegheny River in the north. It was subdivided into Collins and Liberty Township, Allegheny County, Pennsylvania, Liberty townships, all of which were incorporated into Pittsburgh in 1868.
* Pitt Township, Allegheny County, Pennsylvania, Pitt Township
* St. Clair Township, Allegheny County, Pennsylvania, St. Clair Township – stretched from the Monongahela River south to the Washington County line. It divided into Lower St. Clair Township, Allegheny County, Pennsylvania, Lower St. Clair, which eventually became part of the City of Pittsburgh, Dormont, Mount Lebanon, and Upper St. Clair.
* Snowden – now known as South Park Township.
* Sterrett Township
* Temperanceville – what is now Pittsburgh's West End.
* Union Borough – the area surrounding Temperanceville.
* West Liberty, Allegheny County, Pennsylvania, West Liberty Borough – now the neighborhoods of Brookline and Beechview in Pittsburgh.
Population ranking
The population ranking of the following table is based on the 2010 census of Allegheny County.
† ''county seat''
See also
* List of Pennsylvania state historical markers in Allegheny County
* National Register of Historic Places listings in Allegheny County, Pennsylvania
* List of counties in Pennsylvania
Notes
References
External links
Allegheny County official website
Allegheny County Quest
County Map by Municipality
Historic Pittsburgh Map Collection
Southwestern Pennsylvania Commission
{{coord, 40.47, -79.98, display=title, type:adm2nd_region:US-PA_source:UScensus1990
1788 establishments in Pennsylvania
Allegheny County, Pennsylvania,
Pennsylvania counties on the Ohio River
Pennsylvania placenames of Native American origin
Pittsburgh metropolitan area
Populated places established in 1788