COUNTY · OK
Delaware County, Oklahoma
Delaware County is a county in Oklahoma with FIPS code 40041 and an estimated population of 41,703 (Census 2023), 25th largest of 77 in the state.
County facts
- Name
- Delaware County
- State
- Oklahoma
- Type
- county
- FIPS code
- 40041
- State FIPS
- 40
- Population (2023)
- 41,703
- Change since 2020
- +3.2%
- State rank
- 25 of 77
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Delaware County?
Delaware County, Oklahoma has the five-digit FIPS code 40041: 40 for the state and 041 for the county.
What state is Delaware County in?
Delaware 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.