CITY · PA

What county is Pittsburgh, PA in?

Pittsburgh, PA is mostly in Allegheny County. County FIPS code 42003, population 1,224,825 (2023 estimate).

County details

City: Pittsburgh, Pennsylvania
Primary county: Allegheny County
FIPS code: 42003
County population: 1,224,825

Some cities extend into more than one county. Pittsburgh is placed in the county that contains its center. For a specific address, use the address lookup.

Questions

What county is Pittsburgh in?

Pittsburgh, PA is mostly in Allegheny County.

What is the county seat of Allegheny County?

County seats are not part of the data on this site. Check the county’s official website.

Can a city be in two counties?

Yes. Large cities such as Houston and Atlanta cross county lines. The address lookup shows the exact county for any street address.

Sources: U.S. Census Bureau geographic reference files; FCC Area API; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.