COUNTY · KS
Atchison County, Kansas
Atchison County is a county in Kansas with FIPS code 20005 and an estimated population of 16,016 (Census 2023), 31st largest of 105 in the state.
County facts
- Name
- Atchison County
- State
- Kansas
- Type
- county
- FIPS code
- 20005
- State FIPS
- 20
- Population (2023)
- 16,016
- Change since 2020
- -1.9%
- State rank
- 31 of 105
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Atchison County?
Atchison County, Kansas has the five-digit FIPS code 20005: 20 for the state and 005 for the county.
What state is Atchison County in?
Atchison County is in Kansas.
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.