Philadelphia, colloquially referred to as Philly, is the most populous city in the U.S. state of Pennsylvania and the sixth-most populous city in the United States. Its population was 1.60 million at the 2020 census and estimated at 1.57 million in 2025. The Philadelphia metropolitan area, also known as the Delaware Valley, is located in both the Mid-Atlantic and northeastern United States; home to 6.33 million residents, it is the nation's ninth-largest metropolitan area. Philadelphia is known for its culture, cuisine, and history, maintaining contemporary influence in technology and business, sports, and music. Philadelphia was founded in 1682 by William Penn, an English Quaker and advocate of religious freedom, and served as the capital of the colonial era Province of Pennsylvania. It then played a vital role during the American Revolution and Revolutionary War.

County: Philadelphia
Historic countries: Kingdom of England, Kingdom of Great Britain, Netherlands, Sweden, Lenape
Historic colony: Province of Pennsylvania
Founded: 1682 (pp4–5)
Incorporated: October 25, 1701
Founded by: William Penn
• Type: Mayor–council, consolidated city-county
• Body: Philadelphia City Council
• Mayor: Cherelle Parker (D)
Population (2020): 1,603,797
• Estimate (2025): 1,574,281
• Rank: 13th in North America, 6th in the United States, 1st in Pennsylvania
• Urban: 5,696,125 (US: 7th)
• Metro: 6,245,051 (US: 9th)
Demonym(s): Philadelphian
ZIP Codes: 19092–19093, 19099, 191xx
Official Website: https://phila.gov/
Wikidata description: largest city in the U.S. state of Pennsylvania and seat of Philadelphia County
Wikidata id: Q1345
Wikidata label: Philadelphia
Wikidata aliases: Array
Source
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