15 Fastest Declining Large Cities in the US

1. Philadelphia City, Pennsylvania

Population Change Percentage: 1.04%

Topping our list of the fastest declining large cities in the US is Philadelphia City, Pennsylvania. The sixth largest city in the US in terms of population as of 2023, Philadelphia’s population sat at 1.5 million in 2023. Between 2020 and 2023, the population has dropped by 3.13%.

Philadelphia is one of the most historic cities in the US as well, due to its close ties with the American Revolution. It has also played a key role in the industrial era due to a vibrant steel industry which earned it the nickname of Steel City. These days, Philadelphia is still reeling from its lost industry, with estimates from Wharton showing that the city’s population has dropped by more than 600,000 since 1950.

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