COUNTY · OK
Cleveland County, Oklahoma
Cleveland County is a county in Oklahoma with FIPS code 40027 and an estimated population of 301,193 (Census 2023), 3rd largest of 77 in the state.
County facts
- Name
- Cleveland County
- State
- Oklahoma
- Type
- county
- FIPS code
- 40027
- State FIPS
- 40
- Population (2023)
- 301,193
- Change since 2020
- +1.7%
- State rank
- 3 of 77
Population is the Census Bureau’s Vintage 2023 estimate.
Major cities in Cleveland County
Other counties in Oklahoma
Questions
What is the FIPS code for Cleveland County?
Cleveland County, Oklahoma has the five-digit FIPS code 40027: 40 for the state and 027 for the county.
What state is Cleveland County in?
Cleveland 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.