COUNTY · WI
Columbia County, Wisconsin
Columbia County is a county in Wisconsin with FIPS code 55021 and an estimated population of 58,091 (Census 2023), 26th largest of 72 in the state.
County facts
- Name
- Columbia County
- State
- Wisconsin
- Type
- county
- FIPS code
- 55021
- State FIPS
- 55
- Population (2023)
- 58,091
- Change since 2020
- -0.8%
- State rank
- 26 of 72
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Columbia County?
Columbia County, Wisconsin has the five-digit FIPS code 55021: 55 for the state and 021 for the county.
What state is Columbia County in?
Columbia County is in Wisconsin.
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.