COUNTY · OK
Oklahoma County, Oklahoma
Oklahoma County is a county in Oklahoma with FIPS code 40109 and an estimated population of 808,866 (Census 2023), 1st largest of 77 in the state.
County facts
- Name
- Oklahoma County
- State
- Oklahoma
- Type
- county
- FIPS code
- 40109
- State FIPS
- 40
- Population (2023)
- 808,866
- Change since 2020
- +1.3%
- State rank
- 1 of 77
Population is the Census Bureau’s Vintage 2023 estimate.
Major cities in Oklahoma County
Other counties in Oklahoma
Questions
What is the FIPS code for Oklahoma County?
Oklahoma County, Oklahoma has the five-digit FIPS code 40109: 40 for the state and 109 for the county.
What state is Oklahoma County in?
Oklahoma County is in Oklahoma.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.