Delavan leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 83% of adults in Delavan typically vote, above the U.S. average of about 62%. Among adults in Delavan, ~23% vote Democratic, ~60% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How Delavan compares
Among cities within 25 miles, Delavan leans more Republican than 25 of 66 neighbors.
Delavan runs about 54 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Delavan is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Delavan. The southwest side is the most Republican-leaning (R+54) and the north side is the least Republican-leaning (R+35), a spread of about 19 points.
Why Delavan 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 Delavan, not a ranked or complete list of what matters most.
Delavan votes against the grain of Illinois. Illinois leans Democratic overall, while Delavan runs about 54 points more Republican. Dense places usually vote Democratic, but Delavan 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; Delavan, IL sits above the national average 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 Delavan looks the way it does
Turnout in Delavan sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Hopedale, IL R+51
- Emden, IL R+57
- San Jose, IL R+57
- Green Valley, IL R+46
- Natrona, IL R+58
- Dillon, IL R+49
- South Pekin, IL R+46
- Tremont, IL R+47
- Burt, IL R+54
- Hartsburg, IL R+58
Cities with Similar Populations
- McRae, AR R+72
- Warfordsburg, PA R+72
- Thompsontown, PA R+62
- Guthrie Center, IA R+41
- Goldens Bridge, NY D+14
- Southwest Greensburg, PA R+7
- Point Of Rocks, MD R+9
- Hartford, GA R+33
- Starbuck, MN R+40
- Sardis, GA R+22
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.