Trempealeau County leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 66% of adults in Trempealeau County typically vote, near the U.S. average of about 62%. Among adults in Trempealeau County, ~24% vote Democratic, ~42% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.
How Trempealeau County compares
Among counties within 50 miles, Trempealeau County leans more Republican than 6 of 10 neighbors.
Trempealeau County runs about 25 points more Republican than Wisconsin as a whole.
Politics vary noticeably by city within Trempealeau County. The northwest side is the most Republican-leaning (R+35) and the west side is the least Republican-leaning (R+21), a spread of about 14 points.
Why Trempealeau County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Trempealeau County, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 10% of residents in Trempealeau County live in densely developed areas, about 14 points below the Wisconsin average of 24%.
Population density and Republican lean
Places with low population density tend to lean Republican; Trempealeau County, WI sits in the bottom quarter nationally on this measure.
Why turnout in Trempealeau County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Trempealeau County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 65%, about 5 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Buffalo County, WI R+32
- Jackson County, WI R+21
- Winona County, MN R+8
- La Crosse County, WI D+8
- Eau Claire County, WI D+10
- Pepin County, WI R+30
- Houston County, MN R+21
- Wabasha County, MN R+30
- Monroe County, WI R+28
- Chippewa County, WI R+24
Counties with Similar Populations
- Obion County, TN R+52
- Greene County, IN R+55
- Vernon County, WI R+19
- McCurtain County, OK R+55
- Hardin County, OH R+50
- Clare County, MI R+40
- Caroline County, VA R+15
- Jefferson County, ID R+71
- Freeborn County, MN R+22
- Boyle County, KY R+29
Sources and methodology
Precinct-level voting records used to fit the model come from Wisconsin Elections Commission, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.