COUNTY · WI
Trempealeau County, Wisconsin
Trempealeau County is a county in Wisconsin with FIPS code 55121 and an estimated population of 30,899 (Census 2023), 43rd largest of 72 in the state.
County facts
- Name
- Trempealeau County
- State
- Wisconsin
- Type
- county
- FIPS code
- 55121
- State FIPS
- 55
- Population (2023)
- 30,899
- Change since 2020
- +0.3%
- State rank
- 43 of 72
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Trempealeau County?
Trempealeau County, Wisconsin has the five-digit FIPS code 55121: 55 for the state and 121 for the county.
What state is Trempealeau County in?
Trempealeau 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.