Philadelphia, PA

Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and the urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions, with 6.245 million residents . The city's population at the 2020 census was 1,603,797, and over 56 million people live within of Philadelphia.

Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's independence. Philadelphia hosted the First Continental Congress in 1774 following the Boston Tea Party, preserved the Liberty Bell, and hosted the Second Continental Congress during which the founders signed the Declaration of Independence, which historian Joseph Ellis has described as "the most potent and consequential words in American history". Once the Revolutionary War commenced, both the Battle of Germantown and the Siege of Fort Mifflin were fought within Philadelphia's city limits. The U.S. Constitution was later ratified in Philadelphia at the Philadelphia Convention of 1787. Philadelphia remained the nation's largest city until 1790, when it was surpassed by New York City, and served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions during and following the American Revolution, including from 1790 to 1800 while the new national capital of Washington, D.C., was under construction.

With 18 four-year universities and colleges, Philadelphia is one of the nation's leading centers for higher education and academic research. , the Philadelphia metropolitan area was the nation's ninth-largest metropolitan economy with a gross metropolitan product (GMP) of US$479 billion. Philadelphia is the largest center of economic activity in Pennsylvania and the broader multi-state Delaware Valley region; the city is home to five Fortune 500 corporate headquarters as of 2022. The Philadelphia skyline, which includes several globally renowned commercial skyscrapers, is expanding, primarily with new residential high-rise condominiums. The city and the Delaware Valley are a biotechnology and venture capital hub; and the Philadelphia Stock Exchange, owned by NASDAQ, is the nation's oldest stock exchange and a global leader in options trading. 30th Street Station, the city's primary rail station, is the third-busiest Amtrak hub in the nation, and the city's multimodal transport and logistics infrastructure, including Philadelphia International Airport, the PhilaPort seaport, freight rail infrastructure, roadway traffic capacity, and warehouse storage space, are all expanding.

Philadelphia is a national cultural hub, hosting more outdoor sculptures and murals than any other American city. Fairmount Park, when combined with adjacent Wissahickon Valley Park in the same watershed, is , representing one of the nation's largest contiguous urban parks and the 45th largest urban park in the world. The city is known for its arts, culture, cuisine, and colonial and Revolution-era history; in 2016, it attracted 42 million domestic tourists who spent $6.8 billion, representing $11 billion in total economic impact to the city and surrounding Pennsylvania counties.

With five professional sports teams and a hugely loyal fan base, the city is often ranked as the nation's best city for professional sports fans. The city has a culturally and philanthropically active LGBTQ+ community. Philadelphia also has played an immensely influential historic and ongoing role in the development and evolution of American music, especially R&B, soul, and rock.

Philadelphia is a city of many firsts, including the nation's first library (1731), hospital (1751), medical school (1765), national capital (1774), university (by some accounts) (1779), stock exchange (1790), zoo (1874), and business school (1881). Philadelphia contains 67 National Historic Landmarks, including Independence Hall. From the city's 17th century founding through the present, Philadelphia has been the birthplace or home to an extensive number of prominent and influential Americans. In 2021, ''Time'' magazine named Philadelphia one of the world's greatest 100 places.

History

Native peoples

Prior to the arrival of Europeans in the early 17th century, the Philadelphia area was home to the Lenape (Delaware) Indians in the village of Shackamaxon. They were also called the Delaware Indians,Josephy 188–189 and their historical territory was along the Delaware River watershed, western Long Island, and the Lower Hudson Valley. Most Lenape were pushed out of their Delaware homeland during the 18th century by expanding European colonies, exacerbated by losses from intertribal conflicts. Lenape communities were weakened by newly introduced diseases, mainly smallpox, and conflict with Europeans. The Iroquois occasionally fought the Lenape. Surviving Lenape moved west into the upper Ohio River basin. The American Revolutionary War and the United States' independence pushed them further west. In the 1860s, the United States government sent most Lenape remaining in the eastern United States to the Indian Territory (present-day Oklahoma and surrounding territory) under the Indian removal policy.

Colonial

Europeans came to the Delaware Valley in the early 17th century, with the first settlements founded by Dutch colonists, who in 1623 built Fort Nassau on the Delaware River in what is now Brooklawn, New Jersey. The Dutch considered the entire Delaware River valley to be part of their New Netherland colony. In 1638, Swedish settlers led by renegade Dutch established the colony of New Sweden at Fort Christina (present-day Wilmington, Delaware) and quickly spread out in the valley. In 1644, New Sweden supported the Susquehannocks in their war against Maryland colonists. In 1648, the Dutch built Fort Beversreede on the west bank of the Delaware, south of the Schuylkill River near the present-day Eastwick neighborhood, to reassert their dominion over the area. The Swedes responded by building Fort Nya Korsholm, or New Korsholm, named after a town in Finland with a Swedish majority. In 1655, a Dutch military campaign led by New Netherland Director-General Peter Stuyvesant took control of the Swedish colony, ending its claim to independence. The Swedish and Finnish settlers continued to have their own militia, religion, and court, and to enjoy substantial autonomy under the Dutch. An English fleet captured the New Netherland colony in 1664, though the situation did not change substantially until 1682, when the area was included in William Penn's charter for Pennsylvania.

In 1681, in partial repayment of a debt, Charles II of England granted Penn a charter for what would become the Pennsylvania colony. Despite the royal charter, Penn bought the land from the local Lenape to be on good terms with the Native Americans and ensure peace for his colony. Penn made a treaty of friendship with Lenape chief Tammany under an elm tree at Shackamaxon, in what is now the city's Fishtown neighborhood. Penn named the city Philadelphia, which is Greek for "brotherly love," derived from the Ancient Greek terms φίλος ''phílos'' (beloved, dear) and ἀδελφός ''adelphós'' (brother, brotherly). There were a number of cities named ''Philadelphia'' in the Eastern Mediterranean during the Greek and Roman periods, including one (modern Alaşehir) mentioned as the site of an early Christian congregation in the Book of Revelation. As a Quaker, Penn had experienced religious persecution and wanted his colony to be a place where anyone could worship freely. This tolerance, far more than afforded by most other colonies, led to better relations with the local native tribes and fostered Philadelphia's rapid growth into America's most important city.

Penn planned a city on the Delaware River to serve as a port and place for government. Hoping that Philadelphia would become more like an English rural town instead of a city, Penn laid out roads on a grid plan to keep houses and businesses spread far apart, with areas for gardens and orchards.

The city's inhabitants did not follow Penn's plans, however, as they crowded by the present-day Port of Philadelphia on the Delaware River, and subdivided and resold their lots. Before Penn left Philadelphia for the last time, he issued the Charter of 1701 establishing it as a city. Though poor at first, the city became an important trading center with tolerable living conditions by the 1750s. Benjamin Franklin, a leading citizen, helped improve city services and founded new ones, such as fire protection, a library, and one of the American colonies' first hospitals.

A number of philosophical societies were formed, which were centers of the city's intellectual life: the Philadelphia Society for Promoting Agriculture (1785), the Pennsylvania Society for the Encouragement of Manufactures and the Useful Arts (1787), the Academy of Natural Sciences (1812), and the Franklin Institute (1824). These societies developed and financed new industries, attracting skilled and knowledgeable immigrants from Europe.

Revolution

Philadelphia's importance and central location in the colonies made it a natural center for America's revolutionaries. By the 1750s, Philadelphia had surpassed Boston as the largest city and busiest port in British America, and the second-largest city in the entire British Empire, after London. Before the Revolutionary War, in 1774, as resentment of British colonial practices and support for independence was burgeoning in the colonies, Philadelphia hosted the First Continental Congress. From 1775 to 1781, Philadelphia hosted the Second Continental Congress, which adopted the Declaration of Independence in what was then called the Pennsylvania State House and now is called Independence Hall, on July 4, 1776.

Historian Joseph Ellis, in 2007, described the Declaration of Independence as "the most potent and consequential words in American history," and its adoption represented a declaration of war, already ongoing since April 1775, against the British Army, which was then the most powerful military force in the world. Since the Declaration's July 4, 1776, adoption, its signing has been cited globally and repeatedly by various peoples of the world seeking independence and liberty. It also has been, since its adoption, the basis for annual celebration by Americans; in 1938, this celebration of the Declaration was formalized as Independence Day, one of only ten designated U.S. federal holidays.

After George Washington's defeat at the Battle of Brandywine in Chadds Ford Township, Pennsylvania on September 11, 1777, the revolutionary capital of Philadelphia was defenseless. The city prepared for what was perceived to be an inevitable British Army attack. Because bells could easily be recast into munitions, the Liberty Bell, then known as the Pennsylvania State Bell, along with bells from two Philadelphia churches, Christ Church and St. Peter's Church, were hastily taken down and transported by heavily-guarded wagon train out of the city. The Liberty Bell was taken to Zion German Reformed Church in Northampton Town (present-day Allentown), where it was hidden under the church's floor boards for nine months, from September 1777 until the British Army's departure from Philadelphia in June 1778, during the British occupation of Philadelphia. Two Revolutionary War battles, the Siege of Fort Mifflin (September 26 to November 16, 1777) and the Battle of Germantown (October 4, 1777), were both fought within Philadelphia's city limits.

In Philadelphia, the Second Continental Congress adopted the Articles of Confederation on November 15, 1777, and the city later served as the meeting place for the Constitutional Convention, which ratified the Constitution in Independence Hall in Philadelphia on September 17, 1787.

Philadelphia served as capital of the United States for much of the colonial and early post-colonial periods, including for a decade, from 1790 to 1800, while the District of Columbia was being constructed and prepared to serve as the new nation's national capital. In 1793, the largest yellow fever epidemic in U.S. history killed approximately 4,000 to 5,000 people in Philadelphia, or about 10% of the city's population.

The state capital was moved to Lancaster in 1799, then Harrisburg in 1812, while the federal government was moved to Washington, D.C., in 1800 upon completion of the White House and U.S. Capitol building. Philadelphia remained the young nation's largest city until the late 18th century, serving as the nation's financial and cultural center, until ultimately being eclipsed in total population by New York City in 1790. In 1816, the city's free Black community founded the African Methodist Episcopal Church (AME), the first independent Black denomination in the country, and the first Black Episcopal Church. The free black community also established many schools for its children, with the help of Quakers. Large-scale construction projects for new roads, canals, and railroads made Philadelphia the first major industrial city in the United States.

19th century

Throughout the 19th century, Philadelphia hosted a variety of industries and businesses, the largest being textiles. Major corporations in the 19th and early 20th centuries included the Baldwin Locomotive Works, William Cramp & Sons Shipbuilding Company, and the Pennsylvania Railroad. Established in 1870, the Philadelphia Conveyancers' Association was chartered by the state in 1871. Industry, along with the U.S. Centennial, was celebrated in 1876 with the Centennial Exposition, the first official World's fair in the United States.

Immigrants, mostly from Ireland and Germany, settled in Philadelphia and the surrounding districts. These immigrants were largely responsible for the first general strike in North America in 1835, in which workers in the city won the ten-hour workday. The city was a destination for thousands of Irish immigrants fleeing the Great Famine in the 1840s; housing for them was developed south of South Street and later occupied by succeeding immigrants. They established a network of Catholic churches and schools and dominated the Catholic clergy for decades. Anti-Irish, anti-Catholic nativist riots erupted in Philadelphia in 1844. The rise in population of the surrounding districts helped lead to the Act of Consolidation of 1854, which extended the city limits from the of Center City to the roughly of Philadelphia County.
In the latter half of the 19th century and leading into the 20th century, immigrants from Russia, Eastern Europe, and Italy, and African Americans from the southern U.S. settled in the city.

Philadelphia was represented by the Washington Grays in the American Civil War. The African-American population of Philadelphia increased from 31,699 to 219,559 between 1880 and 1930. Twentieth-century black newcomers were part of the Great Migration out of the rural south to northern and midwestern industrial cities.

20th century

By the 20th century, Philadelphia had an entrenched Republican political machine and a complacent population. The first major reform came in 1917 when outrage over the election-year murder of a police officer led to the shrinking of the City Council from two houses to just one. In July 1919, Philadelphia was one of more than 36 industrial cities nationally to suffer a race riot of ethnic whites against blacks during Red Summer, in post-World War I unrest, as recent immigrants competed with blacks for jobs. In the 1920s, the public flouting of Prohibition laws, organized crime, mob violence, and police involvement in illegal activities led to the appointment of Brig. Gen. Smedley Butler of the U.S. Marine Corps as director of public safety, but political pressure prevented any long-term success in fighting crime and corruption.

In 1940, non-Hispanic whites constituted 86.8% of the city's population. The population peaked at more than two million residents in 1950, then began to decline with the restructuring of industry, which led to the loss of many middle-class union jobs. In addition, suburbanization had enticed many of the more affluent residents to outlying railroad commuting towns and newer housing. The resulting reduction in Philadelphia's tax base and the resources of local government caused the city to struggle through a long period of adjustment, with it approaching bankruptcy by the late 1980s.

Revitalization and gentrification of neighborhoods began in the late 1970s and continues into the 21st century, with much of the development occurring in the Center City and University City neighborhoods, while simultaneously exacerbating a shortage of affordable housing in Philadelphia. After many of the old manufacturers and businesses left Philadelphia or shut down, the city started attracting service businesses and began to market itself more aggressively as a tourist destination. Contemporary glass-and-granite skyscrapers were built in Center City beginning in the 1980s. Historic areas such as Old City and Society Hill were renovated during the reformist mayoral era of the 1950s through the 1980s, making those areas among the most desirable neighborhoods in Center City. Many immigrants from around the world began to enter the U.S. through Philadelphia as their gateway. These developments led to a reversal of the city's population decline between 1950 and 2000, during which it lost about 25 percent of its residents.

21st century

Philadelphia eventually began experiencing a growth in its population in 2007, which continued with gradual yearly increases through the present. Although Philadelphia is rapidly undergoing gentrification, the city maintains strategies to minimize displacement of homeowners in gentrifying neighborhoods.

Geography

Topography

The geographic center of Philadelphia is about 40° 0′ 34″ north latitude and 75° 8′ 0″ west longitude. The 40th parallel north passes through neighborhoods in Northeast Philadelphia, North Philadelphia, and West Philadelphia including Fairmount Park. The city encompasses , of which is land and , or 6%, is water. Natural bodies of water include the Delaware and Schuylkill rivers, the lakes in Franklin Delano Roosevelt Park, and Cobbs, Wissahickon, and Pennypack creeks. The largest artificial body of water is the East Park Reservoir in Fairmount Park.

The lowest point is sea level, while the highest point is in Chestnut Hill, about above sea level on Summit Street near the intersection of Germantown Avenue and Bethlehem Pike (example coordinates near high point: 40.07815 N, 75.20747 W).

Philadelphia is situated on the Fall Line that separates the Atlantic coastal plain from the Piedmont. The rapids on the Schuylkill River at East Falls were inundated by the completion of the dam at the Fairmount Water Works.

The city is the seat of its own county. The adjacent counties are Montgomery to the northwest; Bucks to the north and northeast; Burlington County, New Jersey, to the east; Camden County, New Jersey, to the southeast; Gloucester County, New Jersey, to the south; and Delaware County to the southwest.

Cityscape

City planning

Philadelphia's central city was created in the 17th century following the plan by William Penn's surveyor Thomas Holme. Center City is structured with long, straight streets running nearly due east–west and north–south, forming a grid pattern between the Delaware and Schuylkill rivers that is aligned with their courses. The original city plan was designed to allow for easy travel and to keep residences separated by open space that would help prevent the spread of fire. In keeping with the idea of a "Greene Countrie Towne", and inspired by the many types of trees that grew in the region, Penn named many of the east–west streets for local trees. Penn planned the creation of five public parks in the city which were renamed in 1824 (new names in parentheses): Centre Square (Penn Square), Northeast Square ( Franklin Square), Southeast Square ( Washington Square), Southwest Square (Rittenhouse Square), and Northwest Square ( Logan Circle/Square). Center City had an estimated 183,240 residents , making it the second-most populated downtown area in the United States, after Midtown Manhattan in New York City.

Philadelphia's neighborhoods are divided into large sections—North, Northeast, South, Southwest, West, and Northwest—surrounding Center City, which correspond closely with the city's limits before consolidation in 1854. Each of these large areas contains numerous neighborhoods, some of whose boundaries derive from the boroughs, townships, and other communities that constituted Philadelphia County before their inclusion within the city.

The City Planning Commission, tasked with guiding growth and development of the city, has divided the city into 18 planning districts as part of the ''Philadelphia2035'' physical development plan. Much of the city's 1980 zoning code was overhauled from 2007 to 2012 as part of a joint effort between former mayors John F. Street and Michael Nutter. The zoning changes were intended to rectify incorrect zoning maps to facilitate future community development, as the city forecasts an additional 100,000 residents and 40,000 jobs will be added by 2035.

The Philadelphia Housing Authority (PHA) is the largest landlord in Pennsylvania. Established in 1937, the PHA is the nation's fourth-largest housing authority, serving about 81,000 people with affordable housing, while employing 1,400 on a budget of $371 million. The Philadelphia Parking Authority works to ensure adequate parking for city residents, businesses, and visitors.

Architecture

Philadelphia's architectural history dates back to colonial times and includes a wide range of styles. The earliest structures were constructed with logs, but brick structures were common by 1700. During the 18th century, the cityscape was dominated by Georgian architecture, including Independence Hall and Christ Church.

In the first decades of the 19th century, Federal and Greek Revival architecture were the dominant styles produced by Philadelphia architects such as Benjamin Latrobe, William Strickland, John Haviland, John Notman, Thomas Walter, and Samuel Sloan. Frank Furness is considered Philadelphia's greatest architect of the second half of the 19th century. His contemporaries included John McArthur Jr., Addison Hutton, Wilson Eyre, the Wilson Brothers, and Horace Trumbauer. In 1871, construction began on the Second Empire-style Philadelphia City Hall. The Philadelphia Historical Commission was created in 1955 to preserve the cultural and architectural history of the city. The commission maintains the Philadelphia Register of Historic Places, adding historic buildings, structures, sites, objects and districts as it sees fit.

In 1932, Philadelphia became home to the first modern International Style skyscraper in the United States, the PSFS Building, designed by George Howe and William Lescaze. The City Hall remained the tallest building in the city until 1987 when One Liberty Place was completed. Numerous glass and granite skyscrapers were built in Center City beginning in the late 1980s. In 2007, the Comcast Center surpassed One Liberty Place to become the city's tallest building. The Comcast Technology Center was completed in 2018, reaching a height of , as the tallest building in the United States outside of Manhattan and Chicago.

For much of Philadelphia's history, the typical home has been the row house. The row house was introduced to the United States via Philadelphia in the early 19th century and, for a time, row houses built elsewhere in the United States were known as "Philadelphia rows". A variety of row houses are found throughout the city, from Federal-style continuous blocks in Old City and Society Hill to Victorian-style homes in North Philadelphia to twin row houses in West Philadelphia. While newer homes have been built recently, much of the housing dates to the 18th, 19th and early 20th centuries, which has created problems such as urban decay and vacant lots. Some neighborhoods, including Northern Liberties and Society Hill, have been rehabilitated through gentrification.

File:Elfreth's Alley, Philadelphia, 2008.jpg, Elfreth's Alley, "Our nation's oldest residential street", 1702–1836Historical marker on Elfreth's Alley
File:Carpenters' Hall, Philadelphia, USA, May 2015.jpg, Carpenters' Hall exhibiting Georgian architecture, 1770–1774
File:Second Bank of the United States with Robert Morris, Jr. statue, Philadelphia.jpg, Second Bank of the United States exhibiting Greek Revival architecture, 1818–1824
File:City hall Philadelphia.jpg, Second Empire-style Philadelphia City Hall, 1871–1901, from South Broad Street
File:Thirty St Station.jpg, The Art Deco-style grand concourse at 30th Street Station, 1927–1933

Parks

, the total city parkland, including municipal, state and federal parks within the city limits, amounts to . Philadelphia's largest park is Fairmount Park which includes the Philadelphia Zoo and encompasses of the total parkland, while the adjacent Wissahickon Valley Park contains . Fairmount Park, when combined with Wissahickon Valley Park, is one of the largest contiguous urban park areas in the United States. The two parks, along with the Colonial Revival, Georgian and Federal-style mansions contained in them, have been listed as one entity on the National Register of Historic Places since 1972.

Climate

According to the Köppen climate classification, Philadelphia falls under the northern periphery of the humid subtropical climate zone (Köppen ''Cfa''), whereas according to the Trewartha climate classification, the city has a temperate maritime climate (''Do'') limited to the north by the continental climate (''Dc''). Summers are typically hot and muggy, fall and spring are generally mild, and winter is moderately cold. The plant life hardiness zones are 7a and 7b, representing an average annual extreme minimum temperature between .

Snowfall is highly variable, with some winters experiencing only light snow, while others include major snowstorms. The normal seasonal snowfall averages , with rare snowfalls in November or April, and rarely any sustained snow cover. Seasonal snowfall accumulation has ranged from trace amounts in 1972–73 to in the winter of 2009–10. The city's heaviest single-storm snowfall was which occurred in January 1996.

Precipitation is generally spread throughout the year, with eight to eleven wet days per month, at an average annual rate of , but historically ranging from in 1922 to in 2011. The most rain recorded in one day occurred on July 28, 2013, when fell at Philadelphia International Airport. Philadelphia has a moderately sunny climate with an average of 2,498 hours of sunshine annually, and a percentage of sunshine ranging from 47% in December to 61% in June, July, and August.

The January daily average temperature is , though the temperature frequently rises to during thaws and dips to for 2 or 3 nights in a normal winter. July averages , although heat waves accompanied by high humidity and heat indices are frequent, with highs reaching or exceeding on 30 days of the year. The average window for freezing temperatures is November 6 thru April 2, allowing a growing season of 217 days. Early fall and late winter are generally dry with February having the lowest average precipitation at . The dewpoint in the summer averages between .

The highest recorded temperature was on August 7, 1918, but temperatures at or above are not common, with the last occurrence of such a temperature was July 21, 2019. The lowest officially recorded temperature was on February 9, 1934. Temperatures at or below are rare with the last such occurrence being January 19, 1994. The record low maximum is on February 10, 1899, and December 30, 1880, while the record high minimum is on July 23, 2011, and July 24, 2010.

Air quality

Philadelphia County received an ozone grade of F and a 24-hour particle pollution rating of D in the American Lung Association's 2017 State of the Air report, which analyzed data from 2013 to 2015. The city was ranked 22nd for ozone, 20th for short-term particle pollution, and 11th for year-round particle pollution. According to the same report, the city experienced a significant reduction in high ozone days since 2001—from nearly 50 days per year to fewer than 10—along with fewer days of high particle pollution since 2000—from about 19 days per year to about 3—and an approximate 30% reduction in annual levels of particle pollution since 2000. Five of the ten largest combined statistical areas (CSAs) were ranked higher for ozone: Los Angeles (1st), New York City (9th), Houston (12th), Dallas (13th), and San Jose (18th). Many smaller CSAs were also ranked higher for ozone including Sacramento (8th), Las Vegas (10th), Denver (11th), El Paso (16th), and Salt Lake City (20th); however, only two of those same ten CSAs—San Jose and Los Angeles—were ranked higher than Philadelphia for both year-round and short-term particle pollution.

Demographics

According to the 2020 U.S. Census Bureau's tabulation, there were 1,603,797 people residing in Philadelphia, representing a 1.2% increase from the 2019 census estimate. The racial composition of the city was 39.3% Black alone (42.0% Black alone or in combination), 36.3% White alone (41.9% White alone or in combination), 8.7% Asian alone, 0.4% American Indian and Alaska Native alone, 8.7% some other race, and 6.9% multiracial. 14.9% of residents were Hispanic or Latino. 34.8% had a Bachelor's degree or higher. 23.9% spoke a language other than English at home, the most common of which was Spanish (10.8%). 15.0% of the populations foreign born, roughly have of whom are naturalized U.S. citizens. 3.7% of the population are veterans. The median household income was $52,889 and 22.8% of the population lived in poverty. 49.5% of the population drove alone to work, while 23.2% used public transit, 8.2% carpooled, 7.9% walked, and 7.0% worked from home. The average commute is 31 minutes.

After the 1950 census, when a record high of 2,071,605 was recorded, the city's population began a long decline. The population dropped to a low of 1,488,710 residents in 2006 before beginning to rise again. Between 2006 and 2017, Philadelphia added 92,153 residents. In 2017, the U.S. Census Bureau estimated that the racial composition of the city was 41.3% Black (non-Hispanic), 34.9% White (non-Hispanic), 14.1% Hispanic or Latino, 7.1% Asian, 0.4% Native American, 0.05% Pacific Islander, and 2.8% multiracial.

The 2010 census redistricting data indicated that the racial makeup of the city was 644,287 (42.2%) Black (non-Hispanic), 562,585 (36.9%) White (non-Hispanic), 96,405 (6.3%) Asian (2.0% Chinese, 1.2% Indian, 0.9% Vietnamese, 0.4% Korean, 0.3% Filipino, 0.1% Japanese, and 1.4% other), 6,996 (0.5%) Native Americans, 744 (0.05%) Pacific Islanders, and 43,070 (2.8%) from two or more races. Hispanics or Latinos of any race were 187,611 persons (12.3%); 8.0% Puerto Rican, 1.0% Mexican, 0.3% Cuban, and 3.0% other. The racial breakdown of Philadelphia's Hispanic/Latino population was 63,636 (33.9%) White, 17,552 (9.4%) Black, 3,498 (1.9%) Native American, 884 (0.47%) Asian, 287 (0.15%) Pacific Islander, 86,626 (46.2%) from other races, and 15,128 (8.1%) from two or more races. The five largest European ancestries reported in the 2010 census included Irish (13.0%), Italian (8.3%), German (8.2%), Polish (3.9%), and English (3.1%).

The estimated average population density was 11,782 people per square mile (4,549/km) in 2017. In 2010, the U.S. Census Bureau reported that 1,468,623 people (96.2% of the population) lived in households, 38,007 (2.5%) lived in non-institutionalized group quarters, and 19,376 (1.3%) were institutionalized. In 2013, the city reported having 668,247 total housing units, down slightly from 670,171 housing units in 2010. , 87 percent of housing units were occupied, while 13 percent were vacant, a slight change from 2010 where 89.5 percent of units were occupied, or 599,736 and 10.5 percent were vacant, or 70,435. Of the city's residents, 32 percent reported having no vehicles available while 23 percent had two or more vehicles available, .

In 2010, 24.9 percent of households reported having children under the age of 18 living with them, 28.3 percent were married couples living together and 22.5 percent had a female householder with no husband present, 6.0 percent had a male householder with no wife present, and 43.2 percent were non-families. The city reported 34.1 percent of all households were individuals living alone, while 10.5 percent had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 3.20. In 2013, the percentage of women who gave birth in the previous 12 months who were unmarried was 56 percent. Of Philadelphia's adults, 31 percent were married or lived as a couple, 55 percent were not married, 11 percent were divorced or separated, and 3 percent were widowed.

According to the U.S. Census Bureau, the median household income in 2013 was $36,836, down 7.9 percent from 2008 when the inflation-adjusted median household income was $40,008 (in 2013 dollars). For comparison, on an inflation-adjusted basis, the median household income among metropolitan areas was $60,482, down 8.2 percent in the same period, and the national median household income was $55,250, down 7.0 percent from 2008. The city's wealth disparity is evident when neighborhoods are compared. Residents in Society Hill had a 2013 median household income of $93,720, while residents in one of North Philadelphia's districts reported the lowest median household income, $14,185.

More recently, Philadelphia has experienced a large shift toward a younger age profile. In 2000, the city's population pyramid had a largely stationary shape. In 2013, the city took on an expansive pyramid shape, with an increase in the three millennial age groups, 20 to 24, 25 to 29, and 30 to 34. The city's 25- to 29-year-old age group was the city's largest age cohort. According to the 2010 census, 343,837 (22.5%) were under the age of 18; 203,697 (13.3%) from 18 to 24; 434,385 (28.5%) from 25 to 44; 358,778 (23.5%) from 45 to 64; and 185,309 (12.1%) who were 65 years of age or older. The median age was 33.5 years. For every 100 females, there were 89.4 males; while among individuals age 18 and over, for every 100 females, there were 85.7 males. The city had 22,018 births in 2013, down from a peak 23,689 births in 2008. Philadelphia's death rate was at its lowest in at least a half-century, 13,691 deaths in 2013.

Immigration and cultural diversity

Apart from economic growth, another factor contributing to the population increase is Philadelphia's rising immigration rate. Like the millennial population, Philadelphia's immigrant population is also growing rapidly. According to research by The Pew Charitable Trusts, the city's foreign-born population had increased by 69% between 2000 and 2016 to constitute nearly 20% of Philadelphia's work force, and had doubled between 1990 and 2017 to constitute 13.8% of the city's total population, with the top five countries of origin being China by a significant margin, followed by the Dominican Republic, Jamaica, India, and Vietnam.

Irish, Italian, German, Polish, English, Russian, Ukrainian, and French constitute the largest European ethnic groups in the city. Philadelphia has the second-largest Irish and Italian populations in the United States, after New York City. South Philadelphia neighborhoods in the country and is home to the Italian Market.

The Pennsport neighborhood and Gray's Ferry section of South Philadelphia, home to many Mummer clubs, are well known as Irish neighborhoods. The Kensington, Port Richmond, and Fishtown neighborhoods have historically been heavily Irish and Polish. Port Richmond is well known in particular as the center of the Polish immigrant and Polish-American community in Philadelphia, and it remains a common destination for Polish immigrants. Northeast Philadelphia, although known for its Irish and Irish-American population, is also home to a large Jewish and Russian population. Mount Airy in Northwest Philadelphia also contains a large Jewish community, while nearby Chestnut Hill is historically known as an Anglo-Saxon Protestant community.

Philadelphia has a significant gay and lesbian population. Philadelphia's Gayborhood, which is near Washington Square, is home to a large concentration of gay and lesbian friendly businesses, restaurants, and bars.

The Black American population in Philadelphia is the third-largest in the country, after New York City and Chicago. West Philadelphia and North Philadelphia are largely African-American neighborhoods, but many are leaving those areas in favor of the Northeast and Southwest sections of Philadelphia. A higher proportion of African-American Muslims reside in Philadelphia than in most other cities in America. West Philadelphia and Southwest Philadelphia are also home to various significant Afro-Caribbean and African immigrant communities.

The Puerto Rican population in Philadelphia is the second-largest on the mainland United States after New York City, and the second-fastest growing after Orlando. Eastern North Philadelphia, particularly Fairhill and surrounding areas to the north and east, has one of the highest concentrations of Puerto Ricans outside Puerto Rico, with many large swaths of blocks being close to 100% Puerto Rican. Large Puerto Rican and Dominican populations reside in North Philadelphia and the Northeast. In regard to other Latin American populations in Philadelphia, there are significant Mexican and Central American populations in South Philadelphia.

Philadelphia's Asian American population originates mainly from China, India, Vietnam, South Korea, and the Philippines. Over 35,000 Chinese Americans lived in the city in 2015, including a large Fuzhounese population. Center City hosts a growing Chinatown accommodating heavily traveled Chinese-owned bus lines to and from Chinatown, Manhattan in New York City, 95 miles to the north, as Philadelphia is experiencing significant Chinese immigration from New York City. A large Korean community initially settled in the North Philadelphia neighborhood of Olney; however, the primary Koreatown has subsequently shifted northward, straddling the border with the adjacent suburb of Cheltenham in Montgomery County, while also growing in nearby Cherry Hill, New Jersey. South Philadelphia is also home to large Cambodian, Vietnamese, Thai, and Chinese communities.

Religion

According to a 2014 study by the Pew Research Center, 68% of the population of the city identified themselves as Christian. Approximately 41% of Christians in the city and area professed attendance at a variety of churches that could be considered Protestant, while 26% professed Catholic beliefs.

The Protestant Christian community in Philadelphia is dominated by mainline Protestant denominations including the Evangelical Lutheran Church in America, United Church of Christ, the Episcopal Church in the United States, Presbyterian Church (USA) and American Baptist Churches USA. One of the most prominent mainline Protestant jurisdictions is the Episcopal Diocese of Pennsylvania. The African Methodist Episcopal Church was established in Philadelphia. Historically, the city has strong connections to the Quakers, Unitarian Universalism, and the Ethical Culture movement, all of which continue to be represented in the city. The Quaker Friends General Conference is based in Philadelphia. Evangelical Protestants making up less than 15% of the population were also prevalent. Evangelical Protestant bodies included the Anglican Church in North America, Lutheran Church—Missouri Synod, Presbyterian Church in America, and National Baptist Convention of America.

The Catholic community is primarily served by the Latin Catholic Archdiocese of Philadelphia, the Ukrainian Catholic Archeparchy of Philadelphia, and the Syro-Malankara Catholic Eparchy of the United States of America and Canada, though some independent Catholic churches exist throughout Philadelphia and its suburbs. The Latin Church-based jurisdiction is headquartered in the city, and its see is the Cathedral Basilica of Saints Peter and Paul. The Ukrainian Catholic jurisdiction is also headquartered in Philadelphia, and is seated at the Cathedral of the Immaculate Conception.

Less than 1% of Philadelphia's Christians were Mormons. The remainder of the Christian demographic is spread among smaller Protestant denominations and the Eastern and Oriental Orthodox among others. The Diocese of Eastern Pennsylvania (Orthodox Church in America) and Greek Orthodox Archdiocese of America ( Ecumenical Patriarchate) divide the Eastern Orthodox in Philadelphia. The Russian Orthodox St. Andrew's Cathedral is in the city.

The same study says that other religions collectively compose about 8% of the population, including Judaism, Hinduism, Islam, Buddhism, and Sikhism. Philadelphia has the fifth largest Muslim population among American cities. The remaining 24% claimed no religious affiliation.

The Philadelphia metropolitan area's Jewish population was estimated at 206,000 in 2001, which was the sixth largest in the United States at that time. Jewish traders were operating in southeastern Pennsylvania long before William Penn. Furthermore, Jews in Philadelphia took a prominent part in the War of Independence. Although the majority of the early Jewish residents were of Portuguese or Spanish descent, some among them had emigrated from Germany and Poland. About the beginning of the 19th century, a number of Jews from the latter countries, finding the services of the Congregation Mickvé Israel unfamiliar to them, resolved to form a new congregation which would use the ritual to which they had been accustomed.

African diasporic religions are practiced in some Latino and Hispanic and Caribbean communities in North and West Philadelphia.

Languages

, 79.12% (1,112,441) of Philadelphia residents age 5 and older spoke English at home as a primary language, while 9.72% (136,688) spoke Spanish, 1.64% (23,075) Chinese, 0.89% (12,499) Vietnamese, 0.77% (10,885) Russian, 0.66% (9,240) French, 0.61% (8,639) other Asian languages, 0.58% (8,217) African languages, 0.56% (7,933) Cambodian (Mon-Khmer), and Italian was spoken as a main language by 0.55% (7,773) of the population over the age of five. In total, 20.88% (293,544) of Philadelphia's population age 5 and older spoke a mother language other than English.

Economy

Philadelphia’s close geographical and transportation connections to other large metropolitan economies along the Eastern Seaboard of the United States have been cited as offering a significant competitive advantage for business creation and entrepreneurship. The city is the center of economic activity in both Pennsylvania and the four-state Delaware Valley metropolitan region. Five Fortune 500 companies are headquartered in the city. , the Philadelphia metropolitan area is estimated to produce a gross metropolitan product (GMP) of US$479 billion, an increase from the $445 billion calculated by the Bureau of Economic Analysis for 2017, representing the ninth largest U.S. metropolitan economy.

Philadelphia's economic sectors include financial services, health care, biotechnology, information technology, trade and transportation, manufacturing, oil refining, food processing, and tourism. Financial activities account for the largest economic sector of the metropolitan area, which is also one of the largest health education and research centers in the United States. The city's two largest employers are the federal and city governments. Philadelphia's largest private employer is the University of Pennsylvania, followed by the Children's Hospital of Philadelphia. A study commissioned by the city's government in 2011 projected 40,000 jobs would be added to the city within 25 years, raising the number of jobs from 675,000 in 2010 to an estimated 715,000 by 2035.

Corporations

The Philadelphia Stock Exchange, acquired by NASDAQ in 2007, tracks the Philadelphia Semiconductor Index, known in financial circles as the SOX. The city is also home to the headquarters of cable television and internet service provider Comcast, insurance companies Cigna, Colonial Penn, and Independence Blue Cross, food services company Aramark, chemical makers FMC Corporation and Rohm and Haas, pharmaceutical companies GlaxoSmithKline, Amicus Therapeutics, Spark Therapeutics, apparel retailers Five Below and Urban Outfitters and its subsidiary Anthropologie, automotive parts retailer Pep Boys, and stainless steel producer Carpenter Technology Corporation. Other corporation headquarters in the city include RiteAid, Crown Holdings, and Brandywine Realty Trust. The headquarters of Boeing Rotorcraft Systems and its main rotorcraft factory are in the Philadelphia suburb of Ridley Park; The Vanguard Group and the U.S. headquarters of Siemens Healthineers are headquartered in Malvern, Pennsylvania, a Philadelphia suburb; healthcare conglomerate AmerisourceBergen is headquartered in suburban Conshohocken, Pennsylvania; and the Campbell Soup Company and automobile manufacturer Subaru USA are headquartered across the Delaware River in adjacent Camden, New Jersey.

Tech and biotech

Philadelphia is a hub for information technology and biotechnology. Philadelphia and Pennsylvania are attracting new life sciences ventures.
Accessed April 18, 2019. The Philadelphia metropolitan area, comprising the Delaware Valley, has also become a growing hub for venture capital funding.

Tourism

Philadelphia's history attracts many tourists, with the Independence National Historical Park (which includes the Liberty Bell, Independence Hall, and other historic sites) receiving over 5 million visitors in 2016. The city welcomed 42 million domestic tourists in 2016 who spent $6.8 billion, generating an estimated $11 billion in total economic impact in the city and surrounding four counties of Pennsylvania. The annual Naked Bike Ride attracts participants from around the United States and internationally to Philadelphia.

Trade and transportation

Philadelphia International Airport is undergoing a $900 million infrastructural expansion to increase passenger capacity and augment passenger experience; while the Port of Philadelphia, having experienced the highest percentage growth by tonnage loaded in 2017 among major U.S. seaports, was in the process of doubling its shipping capacity to accommodate super-sized post-Panamax shipping vessels in 2018. Philadelphia's 30th Street Station is the third-busiest Amtrak rail hub, following Penn Station in Manhattan and Union Station in Washington, D.C., transporting over 4 million inter-city rail passengers annually.

Education

Primary and secondary education

Education in Philadelphia is provided by many private and public institutions. The School District of Philadelphia is the local school district, operating public schools, in all of the city. The Philadelphia School District is the eighth largest school district in the United States with 142,266 students in 218 traditional public schools and 86 charter schools .

The city's K-12 enrollment in district–run schools dropped from 156,211 students in 2010 to 130,104 students in 2015. During the same time period, the enrollment in charter schools increased from 33,995 students in 2010 to 62,358 students in 2015. This consistent drop in enrollment led the city to close 24 of its public schools in 2013. During the 2014 school year, the city spent an average of $12,570 per pupil, below the average among comparable urban school districts.

Graduation rates among district-run schools, meanwhile, steadily increased in the ten years from 2005. In 2005, Philadelphia had a district graduation rate of 52%. This number increased to 65% in 2014, still below the national and state averages. Scores on the state's standardized test, the Pennsylvania System of School Assessment (PSSA) trended upward from 2005 to 2011 but subsequently decreased. In 2005, the district-run schools scored an average of 37.4% on math and 35.5% on reading. The city's schools reached their peak scores in 2011 with 59.0% on math and 52.3% on reading. In 2014, the scores dropped significantly to 45.2% on math and 42.0% on reading.

Of the city's public high schools, including charter schools, only four performed above the national average on the SAT (1497 out of 2400) in 2014: Masterman, Central, Girard Academic Music Program, and MaST Community Charter School. All other district-run schools were below average.

Higher education

Medical and research facilities of the University of Pennsylvania School of Medicine and the Children's Hospital of Philadelphia.
Philadelphia has the third-largest student concentration on the East Coast, with more than 120,000 college and university students enrolled within the city and nearly 300,000 in the metropolitan area. More than 80 colleges, universities, trade, and specialty schools are in the Philadelphia region. One of the founding members of the Association of American Universities is in the city, the University of Pennsylvania, an Ivy League institution with claims to be the First university in the United States.

The city's largest university, as noted by number of students, is Temple University, followed by Drexel University. The University of Pennsylvania, Temple University, Drexel University, and Thomas Jefferson University comprise the city's nationally ranked research universities. Philadelphia is also home to five schools of medicine: Drexel University College of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia College of Osteopathic Medicine, Temple University School of Medicine, and Thomas Jefferson University's Sidney Kimmel Medical College. Hospitals, universities, and higher education research institutions in Philadelphia's four congressional districts received more than $252 million in National Institutes of Health grants in 2015.

Other institutions of higher learning within the city's borders include:

* Chestnut Hill College
* Community College of Philadelphia
* Curtis Institute of Music
* Holy Family University
* La Salle University
* Moore College of Art and Design
* Peirce College
* Pennsylvania Academy of the Fine Arts