Sullivan leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 71% of adults in Sullivan typically vote, above the U.S. average of about 62%. Among adults in Sullivan, ~19% vote Democratic, ~52% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How Sullivan compares
Among cities within 25 miles, Sullivan leans more Republican than 10 of 76 neighbors.
Sullivan runs about 29 points more Republican than Indiana as a whole.
Politics vary noticeably by neighborhood within Sullivan. The southeast side is the most Republican-leaning (R+59) and the west side is the least Republican-leaning (R+42), a spread of about 17 points.
Why Sullivan 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 Sullivan, not a ranked or complete list of what matters most.
Sullivan votes Republican even though it is densely developed (about 55%, far above the Indiana average of 25%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Sullivan, IN sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Sullivan looks the way it does
Turnout in Sullivan sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Jackson Hill, IN R+60
- Graysville, IN R+55
- Paxton, IN R+61
- Shelburn, IN R+58
- New Lebanon, IN R+54
- Dugger, IN R+62
- Scott City, IN R+59
- Hymera, IN R+61
- Merom, IN R+56
Cities with Similar Populations
- Topeka, IN R+71
- Vassar, MI R+37
- Fox Point, WI D+39
- Kunkletown, PA R+40
- Chisago City, MN R+21
- Anamosa, IA R+21
- Skaneateles, NY D+12
- Barrington, NJ D+17
- Tellico Village, TN R+42
- Pinckneyville, IL R+50
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Sources and methodology
Precinct-level voting records used to fit the model come from Indiana Secretary of State, 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.