Seymour leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 70% of adults in Seymour typically vote, above the U.S. average of about 62%. Among adults in Seymour, ~22% vote Democratic, ~48% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How Seymour compares
Among cities within 25 miles, Seymour leans more Republican than 12 of 64 neighbors.
Seymour runs about 46 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Seymour is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Seymour. The west side is the most Republican-leaning (R+39) and the northwest side is the least Republican-leaning (R+24), a spread of about 16 points.
Why Seymour 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 Seymour, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 88% of residents in Seymour drive to work alone, about 14 points above the U.S. average of 74%. Seymour runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Seymour, IL sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Seymour looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Seymour 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 68%, about 8 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 99% of adults in Seymour have completed high school, above 97% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Bondville, IL R+39
- White Heath, IL R+36
- Mahomet, IL R+11
- Galesville, IL R+41
- Mansfield, IL R+36
- Champaign, IL D+45
- Monticello, IL R+27
- Savoy, IL D+29
- Ivesdale, IL R+36
- Sadorus, IL R+34
Cities with Similar Populations
- Lower Village, NH R+6
- Wakonda, SD R+44
- Moffitt, TX R+73
- Springville Lake Estates, AL R+80
- Nocona Hills, TX R+76
- Hardin Springs, KY R+68
- Wilda, VA R+53
- Yellow Creek, PA R+73
- Hunter, IL R+34
- Chesterfield, MA D+30
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.