Allegheny County Flag

Allegheny County

State:
Pennsylvania
County Seat:
Pittsburgh

Allegheny County's estimated 2025 population is 1,209,265 with a growth rate of -0.64% in the past year according to the most recent United States census data. Allegheny County is the 2nd largest county in Pennsylvania. The 2010 population was 1,223,973 and has seen a growth of -1.2% since that time.

1,209,265
Total Population
1,657
Population Density (mi²)
2
Population Rank (State)
-7.8K -0.64%
Annual Population Growth

Allegheny County Population

Demographics

Economics and Income Statistics