Trenton leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 88% of adults in Trenton typically vote, above the U.S. average of about 62%. Among adults in Trenton, ~27% vote Democratic, ~61% Republican, and ~12% don't vote. The map below shows estimated turnout by block group.
How Trenton compares
Among cities within 25 miles, Trenton leans more Republican than 37 of 85 neighbors.
Trenton runs about 50 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Trenton is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Trenton. The north side is the most Republican-leaning (R+50) and the south side is the least Republican-leaning (R+35), a spread of about 15 points.
Why Trenton 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 Trenton, not a ranked or complete list of what matters most.
Trenton votes against the grain of Illinois. Illinois leans Democratic overall, while Trenton runs about 50 points more Republican. Dense places usually vote Democratic, but Trenton runs against that pattern.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Trenton, 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 Trenton looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Trenton 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 96% of adults in Trenton have completed high school, above 82% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Aviston, IL R+41
- Summerfield, IL R+38
- St. Rose, IL R+64
- New Baden, IL R+37
- Albers, IL R+58
- Highland, IL R+28
- Breese, IL R+53
- Germantown, IL R+54
- St. Jacob, IL R+37
- Lebanon, IL R+13
Cities with Similar Populations
- Salem, SC R+48
- Halethorpe, MD D+12
- Culleoka, TN R+62
- Coxsackie, NY D+8
- Freedom, PA R+33
- St. Leonard, MD R+25
- Comanche, TX R+60
- Salmon, ID R+59
- Silver Springs, NV R+49
- Norton, VA R+49
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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.