Philadelphia, colloquially referred to as Philly, is a city located in the United States. It serves as the most populous city in the state of Pennsylvania and ranks as the sixth-most populous city in the United States. According to the 2020 census, the city had a population of 1.60 million, with an estimated population of 1.57 million in 2025.
The Philadelphia metropolitan area, also known as the Delaware Valley, has a population of 6.33 million residents and is the ninth-largest metropolitan area in the nation. The city is recognized for its history, culture, and cuisine, while maintaining contemporary influence in various sectors including music, sports, business, and technology.