Delaware County leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 62% of adults in Delaware County typically vote, near the U.S. average of about 62%. Among adults in Delaware County, ~28% vote Democratic, ~34% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How Delaware County compares
Among counties within 50 miles, Delaware County leans more Republican than 2 of 21 neighbors.
Delaware County runs about 8 points more Democratic than Indiana as a whole.
Politics vary noticeably by city within Delaware County. The west side runs the most Democratic (D+2) and the northeast side runs the most Republican (R+41), a spread of about 43 points.
Why Delaware 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 Delaware County, not a ranked or complete list of what matters most.
Delaware County votes Republican even though it is densely developed (about 66%, far above the Indiana average of 25%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Delaware County, IN sits in the top quarter nationally on this measure.
Why turnout in Delaware County looks the way it does
Renters vote less often than owners. About 33% of households in Delaware County rent, about 8 points above the U.S. average of 25%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Madison County, IN R+25
- Blackford County, IN R+49
- Henry County, IN R+47
- Randolph County, IN R+55
- Jay County, IN R+58
- Grant County, IN R+34
- Wayne County, IN R+31
- Tipton County, IN R+52
- Hancock County, IN R+36
- Hamilton County, IN R+5
Counties with Similar Populations
- Albemarle County, VA D+24
- LaPorte County, IN R+11
- Ontario County, NY R+2
- Newton County, GA D+16
- Craighead County, AR R+27
- Douglas County, OR R+29
- Androscoggin County, ME R+12
- Cowlitz County, WA R+18
- Hardin County, KY R+27
- Mercer County, PA R+27
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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.