Brereton leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 78% of adults in Brereton typically vote, above the U.S. average of about 62%. Among adults in Brereton, ~25% vote Democratic, ~53% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How Brereton compares
Among cities within 25 miles, Brereton leans more Republican than 21 of 77 neighbors.
Brereton runs about 47 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Brereton is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Brereton. The southeast side is the most Republican-leaning (R+38) and the southwest side is the least Republican-leaning (R+21), a spread of about 17 points.
Why Brereton 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 Brereton, not a ranked or complete list of what matters most.
Brereton votes against the grain of Illinois. Illinois leans Democratic overall, while Brereton runs about 47 points more Republican. Car-dependent areas vote Republican, and about 86% of residents in Brereton drive to work alone, above 86% of cities. A high family-household share predicts Republican voting, and about 82% of households in Brereton are family households, above 93% of cities.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; Brereton, IL sits in the top tenth nationally on this measure.
Why turnout in Brereton looks the way it does
Homeowners vote more often than renters. About 95% of households in Brereton own their home, about 16 points above the Illinois average of 80%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Norris, IL R+37
- Rawalts, IL R+39
- Canton, IL R+18
- Breeds, IL R+39
- Farmington, IL R+25
- Middlegrove, IL R+41
- Trivoli, IL R+36
- Fairview, IL R+38
- Dunfermline, IL R+39
Cities with Similar Populations
- Youngstown, IN R+33
- North Branch, WI R+38
- Taft Southwest, TX R+39
- Tanacross, AK R+9
- Talladega Springs, AL R+76
- Sydney, ND R+57
- Tarlton, TN R+71
- Non, OK R+71
- Rosedale, CO R+43
- Sagerton, TX R+77
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Illinois State Board of Elections, 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.