Getting Bigger

City of Philadelphia:
2010: 1,526,006
2020: 1,578,487 (+3.3%!)
🚨The City's highest 10-year growth rate since the 1940s🚨

— Christopher Mulroy (@TopherDominic) May 5, 2021

These are estimates, not the Census counts (which might be garbage so I'll take the estimates).

Decennial population peaked at 2,071,605 in 1950. Trough at 1,517,550 in 2000.