COUNTY · KS
Riley County, Kansas
Riley County is a county in Kansas with FIPS code 20161 and an estimated population of 71,402 (Census 2023), 7th largest of 105 in the state.
County facts
- Name
- Riley County
- State
- Kansas
- Type
- county
- FIPS code
- 20161
- State FIPS
- 20
- Population (2023)
- 71,402
- Change since 2020
- -0.9%
- State rank
- 7 of 105
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Riley County?
Riley County, Kansas has the five-digit FIPS code 20161: 20 for the state and 161 for the county.
What state is Riley County in?
Riley 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.