CITY · OK

What county is Oklahoma City, OK in?

Oklahoma City, OK is mostly in Oklahoma County. County FIPS code 40109, population 808,866 (2023 estimate).

County details

City: Oklahoma City, Oklahoma
Primary county: Oklahoma County
FIPS code: 40109
County population: 808,866

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

Questions

What county is Oklahoma City in?

Oklahoma City, OK is mostly in Oklahoma County.

What is the county seat of Oklahoma 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.