Fairview Heights leans Democratic by roughly 18 points: about 59% of voters vote Democratic and 41% Republican.
About 71% of adults in Fairview Heights typically vote, above the U.S. average of about 62%. Among adults in Fairview Heights, ~42% vote Democratic, ~29% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How Fairview Heights compares
Among cities within 25 miles, Fairview Heights leans more Democratic than 95 of 166 neighbors.
Fairview Heights runs about 7 points more Democratic than Illinois as a whole.
Politics vary noticeably by neighborhood within Fairview Heights. The southeast side is the most Democratic-leaning (D+33) and the northwest side is the least Democratic-leaning (Even), a spread of about 32 points.
Why Fairview Heights 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 Fairview Heights, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 71% of residents in Fairview Heights live in densely developed areas, about 35 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Fairview Heights sits in the top quarter (about 35%, above 82% of cities). A high never-married share predicts Democratic voting, and about 36% of adults in Fairview Heights have never been married, above 89% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Fairview Heights, IL sits in the top tenth nationally on this measure.
Why turnout in Fairview Heights looks the way it does
Turnout in Fairview Heights 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
- Swansea, IL D+10
- Caseyville, IL R+8
- O'Fallon, IL D+8
- Belleville, IL D+19
- Shiloh, IL D+15
- State Park Place, IL D+12
- Washington Park, IL D+63
- Centreville, IL D+84
- Collinsville, IL Even
- Alorton, IL D+82
Cities with Similar Populations
- Las Vegas, NM D+29
- Gilbertsville, PA R+14
- Chesnee, SC R+60
- Glenmont, MD D+51
- Sayville, NY R+18
- Marco Island, FL R+31
- North Reading, MA D+9
- Commerce, GA R+57
- Spearfish, SD R+32
- Grand Ledge, MI R+4
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.