Madison County leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 65% of adults in Madison County typically vote, near the U.S. average of about 62%. Among adults in Madison County, ~24% vote Democratic, ~41% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How Madison County compares
Among counties within 50 miles, Madison County leans more Republican than 5 of 20 neighbors.
Madison County runs about 6 points more Republican than Indiana as a whole.
Politics vary noticeably by city within Madison County. The northeast side is the most Republican-leaning (R+47) and the south side is the least Republican-leaning (R+20), a spread of about 27 points.
Why Madison 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 Madison County, not a ranked or complete list of what matters most.
Madison County votes Republican even though it is densely developed (about 58%, 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; Madison County, 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 Madison County looks the way it does
Turnout in Madison County sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Delaware County, IN R+11
- Hamilton County, IN R+5
- Henry County, IN R+47
- Hancock County, IN R+36
- Tipton County, IN R+52
- Grant County, IN R+34
- Blackford County, IN R+49
- Marion County, IN D+29
- Howard County, IN R+30
- Rush County, IN R+57
Counties with Similar Populations
- Rapides Parish, LA R+24
- Washington County, RI D+11
- Sumter County, FL R+31
- Skagit County, WA D+4
- Strafford County, NH D+4
- Wichita County, TX R+31
- Black Hawk County, IA D+3
- Berkshire County, MA D+27
- Hunterdon County, NJ R+6
- Tazewell County, IL R+29
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.