CITY · OH

What county is Cincinnati, OH in?

Cincinnati, OH is mostly in Hamilton County. County FIPS code 39061, population 827,058 (2023 estimate).

County details

City: Cincinnati, Ohio
Primary county: Hamilton County
FIPS code: 39061
County population: 827,058

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

Questions

What county is Cincinnati in?

Cincinnati, OH is mostly in Hamilton County.

What is the county seat of Hamilton 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.