Brillion leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 89% of adults in Brillion typically vote, above the U.S. average of about 62%. Among adults in Brillion, ~28% vote Democratic, ~61% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How Brillion compares
Among cities within 25 miles, Brillion leans more Republican than 26 of 82 neighbors.
Brillion runs about 37 points more Republican than Wisconsin as a whole.
Politics vary noticeably by neighborhood within Brillion. The southwest side is the most Republican-leaning (R+51) and the east side is the least Republican-leaning (R+34), a spread of about 17 points.
Why Brillion leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Brillion, not a ranked or complete list of what matters most.
Brillion votes Republican even though it is densely developed (about 32%, modestly above the Wisconsin average of 24%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Brillion, WI sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Brillion looks the way it does
Turnout in Brillion sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Forest Junction, WI R+50
- Potter, WI R+48
- Hilbert Junction, WI R+49
- Hilbert, WI R+44
- Maple Grove, WI R+51
- St. John, WI R+51
- Wayside, WI R+50
- Holland, WI R+45
- Collins, WI R+49
- Morrison, WI R+48
Cities with Similar Populations
- Osage, IA R+29
- Crystal City, MO R+38
- Jermyn, PA R+13
- Robbins, IL D+77
- Woodlyn, PA D+17
- Pearcy, AR R+57
- Mascot, TN R+59
- Akron, PA R+22
- Benton, TN R+71
- Roaring Spring, PA R+56
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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.