Philadelphia, commonly referred to as Philly, is the most populous city in the U.S. state of Pennsylvania and the sixth-most populous city in the nation, with a population of 1,603,797 in the 2020 census. The city is the urban core of the larger Delaware Valley, als…Philadelphia, commonly referred to as Philly, is the most populous city in the U.S. state of Pennsylvania and the sixth-most populous city in the nation, with a population of 1,603,797 in the 2020 census. The city is the urban core of the larger Delaware Valley, also known as the Philadelphia metropolitan area, the nation's seventh-largest and one of the world's largest metropolitan regions with 6.245 million residents in its metropolitan statistical area and 7.366 million residents in its combined statistical area.
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