COUNTY · KS
Marion County, Kansas
Marion County is a county in Kansas with FIPS code 20115 and an estimated population of 11,690 (Census 2023), 37th largest of 105 in the state.
County facts
- Name
- Marion County
- State
- Kansas
- Type
- county
- FIPS code
- 20115
- State FIPS
- 20
- Population (2023)
- 11,690
- Change since 2020
- -0.9%
- State rank
- 37 of 105
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Marion County?
Marion County, Kansas has the five-digit FIPS code 20115: 20 for the state and 115 for the county.
What state is Marion County in?
Marion 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.