Spencer County leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 74% of adults in Spencer County typically vote, above the U.S. average of about 62%. Among adults in Spencer County, ~19% vote Democratic, ~55% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Spencer County compares
Among counties within 50 miles, Spencer County leans more Republican than 8 of 18 neighbors.
Spencer County runs about 30 points more Republican than Indiana as a whole.
Politics vary noticeably by city within Spencer County. The east side is the most Republican-leaning (R+53) and the northeast side is the least Republican-leaning (R+42), a spread of about 11 points.
Why Spencer County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Spencer County, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 88% of residents in Spencer County drive to work alone, about 14 points above the U.S. average of 74%.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Spencer County, IN sits in the bottom 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 Spencer County looks the way it does
Homeowners vote more often than renters. About 82% of households in Spencer County own their home, about 7 points above the U.S. average of 75%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Hancock County, KY R+52
- Perry County, IN R+39
- Warrick County, IN R+33
- Daviess County, KY R+31
- Dubois County, IN R+44
- Vanderburgh County, IN R+9
- Pike County, IN R+55
- Henderson County, KY R+33
- Gibson County, IN R+49
- McLean County, KY R+58
Counties with Similar Populations
- Union County, TN R+70
- Tyler County, TX R+70
- DeWitt County, TX R+49
- Plumas County, CA R+23
- Wayne County, MS R+25
- Franklin Parish, LA R+38
- Monroe County, AL R+23
- Orange County, IN R+54
- Douglas County, IL R+48
- Pierce County, GA R+71
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.