CITY · CA

What county is Oakland, CA in?

Oakland, CA is mostly in Alameda County. County FIPS code 06001, population 1,622,188 (2023 estimate).

County details

City: Oakland, California
Primary county: Alameda County
FIPS code: 06001
County population: 1,622,188

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

Questions

What county is Oakland in?

Oakland, CA is mostly in Alameda County.

What is the county seat of Alameda 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.