Hendricks County leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 79% of adults in Hendricks County typically vote, above the U.S. average of about 62%. Among adults in Hendricks County, ~32% vote Democratic, ~47% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.
How Hendricks County compares
Among counties within 50 miles, Hendricks County leans more Republican than 4 of 18 neighbors.
Politically, Hendricks County sits close to the rest of Indiana.
Politics vary noticeably by city within Hendricks County. The east side runs the most Democratic (Even) and the southwest side runs the most Republican (R+54), a spread of about 54 points.
Why Hendricks 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 Hendricks County, not a ranked or complete list of what matters most.
Hendricks County votes Republican even though it is densely developed (about 65%, far above the Indiana average of 25%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 75% of households in Hendricks County are family households, above 95% of counties.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Hendricks County, IN sits in the top tenth nationally 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 Hendricks County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Hendricks County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 68%, about 8 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Marion County, IN D+29
- Boone County, IN R+19
- Morgan County, IN R+51
- Johnson County, IN R+35
- Putnam County, IN R+46
- Hamilton County, IN R+5
- Hancock County, IN R+36
- Montgomery County, IN R+44
- Clinton County, IN R+45
- Shelby County, IN R+47
Counties with Similar Populations
- Scott County, IA D+5
- Bay County, FL R+35
- Lee County, AL R+13
- Muskegon County, MI Even
- Porter County, IN R+11
- Carroll County, MD R+24
- Guadalupe County, TX R+23
- Winnebago County, WI R+3
- Alamance County, NC R+4
- Kootenai County, ID R+46
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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.