COUNTY · OR
Jefferson County, Oregon
Jefferson County is a county in Oregon with FIPS code 41031 and an estimated population of 25,454 (Census 2023), 25th largest of 36 in the state.
County facts
- Name
- Jefferson County
- State
- Oregon
- Type
- county
- FIPS code
- 41031
- State FIPS
- 41
- Population (2023)
- 25,454
- Change since 2020
- +3.6%
- State rank
- 25 of 36
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Jefferson County?
Jefferson County, Oregon has the five-digit FIPS code 41031: 41 for the state and 031 for the county.
What state is Jefferson County in?
Jefferson County is in Oregon.
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.