Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania,[10] 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 as of 2020.[11] The city's population as of the 2020 census was 1,603,797, and over 56 million people live within 250 mi (400 km) of Philadelphia.[12]

City of Philadelphia
Etymology: Ancient Greek: φίλος phílos (beloved, dear) and ἀδελφός adelphós (brother, brotherly)
"Philly", "The City of Brotherly Love", “America’s Garden Capital”,[1] "The Athens of America",[2] and other nicknames of Philadelphia
"Philadelphia maneto" ("Let brotherly love endure" or "... continue")[3][4]
Interactive maps of Philadelphia
Coordinates: 39°57′10″N 75°09′49″W
CountryUnited States
Historic countriesKingdom of England
Kingdom of Great Britain
Historic colonyProvince of Pennsylvania
IncorporatedOctober 25, 1701
Founded byWilliam Penn
  TypeMayor–council, consolidated city-county
  BodyPhiladelphia City Council
  MayorJim Kenney (D)
  Consolidated city-county142.70 sq mi (369.59 km2)
  Land134.36 sq mi (347.98 km2)
  Water8.34 sq mi (21.61 km2)
39 ft (12 m)
  Consolidated city-county1,603,797
  Rank6th in the United States
1st in Pennsylvania
  Density11,936.92/sq mi (4,608.86/km2)
  Metro6,245,051 (7th)
Time zoneUTC−5 (EST)
  Summer (DST)UTC−4 (EDT)
ZIP Codes
19092–19093, 19099, 191xx
Area codes215, 267, 445
FIPS code42-60000
GNIS feature ID1215531[9]
School districtPhiladelphia School District
International airportPhiladelphia International Airport
U.S. Routes
Commuter railSEPTA Regional Rail, NJ Transit
Rapid transitBroad Street Line, Market–Frankford Line, PATCO Speedline
WaterwaysDelaware River
Schuylkill River

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[5][13] 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".[14] 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.

During the 19th and 20th centuries, Philadelphia emerged as a major national industrial center and railroad hub. The city’s blossoming industrial sector attracted European immigrants, predominantly from Germany and Ireland, the two largest reported ancestry groups in the city as of 2015. In the 20th century, immigrant waves from Italy and elsewhere in Southern Europe arrived.[15] Following the end of the Civil War in 1865, Philadelphia became a leading destination for African Americans in the Great Migration.[16] In the 20th century, Puerto Rican Americans moved to the city in large numbers.[17] Between 1890 and 1950, Philadelphia's population doubled to 2.07 million. Philadelphia has since attracted immigrants from East and South Asia, Eastern Europe, and Latin America.

With 18 four-year universities and colleges, Philadelphia is one of the nation's leading centers for higher education and academic research.[18][19] As of 2021, the Philadelphia metropolitan area was the nation's ninth-largest metropolitan economy with a gross metropolitan product (GMP) of US$479 billion.[20] 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.[21] The Philadelphia skyline, which includes several globally renowned commercial skyscrapers, is expanding, primarily with new residential high-rise condominiums.[22] The city and the Delaware Valley are a biotechnology[23] 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.[24] 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.[25][26] Fairmount Park, when combined with adjacent Wissahickon Valley Park in the same watershed, is 2,052 acres (830 ha), representing one of the nation's largest contiguous urban parks and the 45th largest urban park in the world.[27] 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.[28]

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.[29][30][31][32] 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.[33][34]

Philadelphia is a city of many firsts, including the nation's first library (1731),[35] hospital (1751),[35] medical school (1765),[36] national capital (1774),[37] university (by some accounts) (1779),[38] stock exchange (1790),[35] zoo (1874),[39] and business school (1881).[40] Philadelphia contains 67 National Historic Landmarks, including Independence Hall.[41][42][19] 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.[43]

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