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 ...

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

, 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 Peter Chartier (c. 16901759) (Anglicized version of Pierre Chartier, sometimes written Chartiere, Chartiers, Shartee or Shortive) was a fur trader of mixed Shawnee and French parentage. Multilingual, he later became a leader and a band chief am ...

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

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

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

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

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

. 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 *

, 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

, 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 ten
among 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 Chatham University is a private university in Pittsburgh, Pennsylvania. Originally founded as a women's college, it began enrolling men in undergraduate programs in 2015. It enrolls about 2,110 students, including 1,002 undergraduate students and ...

* 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

Map of Allegheny County Pennsylvania 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 Oakland Catholic High School is a private, Roman Catholic college preparatory school for girls, located in the Oakland (Pittsburgh), Oakland neighborhood of Pittsburgh, Pennsylvania, United States, within the Roman Catholic Diocese of Pittsburgh, ...

* 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 * Turnpike-576

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 19

US Route 19 U.S. Route 19 or U.S. Highway 19 (US 19) is a north–south United States Numbered Highway in the Eastern United States. Despite encroaching Interstate Highways, the route has remained a long-haul road, connecting the Gulf of Mex ...

runs north to south from Warrendale to Upper St. Clair * US 22

US Route 22 runs west to east, along much of US Route 30 and Interstate 376, from Imperial to Monroeville * US 30

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

, and Allegheny Islands State Park is in the

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

Map of Allegheny County Pennsylvania With Municipal and Township Labels

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 *

(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 * Collier *

Crescent A crescent shape (, ) is a symbol or emblem used to represent the lunar phase (as it appears in the northern hemisphere) in the first quarter (the "sickle moon"), or by extension a symbol representing the Moon itself. In Hindu iconography, Hind ...

* East Deer * Elizabeth * Fawn * Findlay * Forward * Frazer * Hampton * Harmar * Harrison *

Indiana Indiana ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders Lake Michigan to the northwest, Michigan to the north and northeast, Ohio to the east, the Ohio River and Kentucky to the s ...

* Kennedy * Kilbuck *

Leet Leet (or "1337"), also known as eleet or leetspeak, or simply hacker speech, is a system of modified spellings used primarily on the Internet. It often uses character replacements in ways that play on the similarity of their glyphs via refle ...

Marshall Marshall may refer to: Places Australia *Marshall, Victoria, a suburb of Geelong, Victoria ** Marshall railway station Canada * Marshall, Saskatchewan * The Marshall, a mountain in British Columbia Liberia * Marshall, Liberia Marshall Is ...

* McCandless *

Moon The Moon is Earth's only natural satellite. It Orbit of the Moon, orbits around Earth at Lunar distance, an average distance of (; about 30 times Earth diameter, Earth's diameter). The Moon rotation, rotates, with a rotation period (lunar ...

* Mt. Lebanon * Neville * North Fayette * North Versailles * O'Hara *

* Penn Hills *

Pine A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. ''World Flora Online'' accepts 134 species-rank taxa (119 species and 15 nothospecies) of pines as cu ...

* Reserve * Richland * Robinson * Ross * Scott * Shaler * South Fayette *

South Park ''South Park'' is an American animated sitcom created by Trey Parker and Matt Stone, and developed by Brian Graden for Comedy Central. The series revolves around four boysStan Marsh, Kyle Broflovski, Eric Cartman, and Kenny McCormickand the ...

* South Versailles * Springdale * Stowe * Upper Saint Clair * West Deer * Wilkins

Census-designated places

Census-designated place A census-designated place (CDP) is a Place (United States Census Bureau), concentration of population defined by the United States Census Bureau for statistical purposes only. CDPs have been used in each decennial census since 1980 as the counte ...

s are geographical areas designated by the

US Census Bureau The United States Census Bureau, officially the Bureau of the Census, is a principal agency of the U.S. federal statistical system, responsible for producing data about the American people and economy. The U.S. Census Bureau is part of the U ...

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 * Bairdford * Bakerstown *

Boston Boston is the capital and most populous city in the Commonwealth (U.S. state), Commonwealth of Massachusetts in the United States. The city serves as the cultural and Financial centre, financial center of New England, a region of the Northeas ...

* Carnot-Moon * Clinton * Curtisville * Enlow * Gibsonia * Glenshaw *

Greenock Greenock (; ; , ) is a town in Inverclyde, Scotland, located in the west central Lowlands of Scotland. The town is the administrative centre of Inverclyde Council. It is a former burgh within the historic county of Renfrewshire, and forms ...

* Harwick * Imperial * Noblestown * Rennerdale * Russellton *

Sturgeon Sturgeon (from Old English ultimately from Proto-Indo-European language, Proto-Indo-European *''str̥(Hx)yón''-) is the common name for the 27 species of fish belonging to the family Acipenseridae. The earliest sturgeon fossils date to the ...

Unincorporated communities

* Acmetonia * Blackridge * Blanchard * Broughton * Bruceton * Buena Vista * Creighton * Cubbage Hill * Cuddy * Dorseyville * Ewingsville * Harmarville * Indianola * Ingomar * Karns * Keown Station * Kirwan Heights *

Library A library is a collection of Book, books, and possibly other Document, materials and Media (communication), media, that is accessible for use by its members and members of allied institutions. Libraries provide physical (hard copies) or electron ...

* McKnight * Moon Run *

Mount Vernon Mount Vernon is the former residence and plantation of George Washington, a Founding Father, commander of the Continental Army in the Revolutionary War, and the first president of the United States, and his wife, Martha. An American landmar ...

* Natrona * Natrona Heights * Nevillewood * Presto * Regent Square * Rural Ridge * Sheraden * Warrendale *

Wexford Wexford ( ; archaic Yola dialect, Yola: ''Weiseforthe'') is the county town of County Wexford, Republic of Ireland, Ireland. Wexford lies on the south side of Wexford Harbour, the estuary of the River Slaney near the southeastern corner of the ...

* Wildwood

Former places

Many political subdivisions of Allegheny County have come and gone through subdivision or annexation through the years. These include: * 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 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 – in what is now the northeast part of the City of Pittsburgh, east of Lawrenceville and north of

Penn Avenue Penn Avenue is a major arterial street in Pittsburgh, Pennsylvania, Pittsburgh and Wilkinsburg, Pennsylvania, Wilkinsburg, in Pennsylvania, United States. Its western terminus lies at Gateway Center (Pittsburgh), Gateway Center in Downtown Pi ...

. * Knoxville Borough * Lawrenceville Borough * 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 of Pittsburgh. The borough was annexed to Pittsburgh in 1837 as the first addition to the city's original territory. * 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) to the Allegheny River in the north. It was subdivided into Collins and

townships, all of which were incorporated into Pittsburgh in 1868. * Pitt Township * St. Clair Township – stretched from the Monongahela River south to the Washington County line. It divided into 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 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''

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 Pennsylvania counties on the Ohio River Pennsylvania placenames of Native American origin Pittsburgh metropolitan area Populated places established in 1788