Brighton leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 82% of adults in Brighton typically vote, above the U.S. average of about 62%. Among adults in Brighton, ~21% vote Democratic, ~61% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Brighton compares
Among cities within 25 miles, Brighton leans more Republican than 83 of 118 neighbors.
Brighton runs about 58 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Brighton is one of the few Republican-leaning pockets.
Why Brighton 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 Brighton, not a ranked or complete list of what matters most.
Brighton votes against the grain of Illinois. Illinois leans Democratic overall, while Brighton runs about 58 points more Republican. Dense places usually vote Democratic, but Brighton runs against that pattern. A high family-household share predicts Republican voting, and about 77% of households in Brighton are family households, above 82% of cities.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; Brighton, IL sits in the top quarter nationally on this measure.
Why turnout in Brighton looks the way it does
Turnout in Brighton sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Miles Station, IL R+54
- Piasa, IL R+53
- Fosterburg, IL R+42
- Godfrey, IL R+18
- Fidelity, IL R+60
- Alton, IL D+11
- Cottage Hills, IL R+24
- Bunker Hill, IL R+47
- Dow, IL R+36
Cities with Similar Populations
- Whispering Pines, NC R+26
- Colgate, WI R+36
- Chicora, PA R+54
- Lochridge, TX R+31
- Enon, OH R+35
- Vandercook Lake, MI R+18
- Winnie, TX R+53
- Tuskegee Institute, AL D+84
- Batesburg-Leesville, SC R+11
- Kent City, MI R+40
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.