Zionsville is a true toss-up. About 52% of voters here vote Democratic and 48% Republican.
About 92% of adults in Zionsville typically vote, above the U.S. average of about 62%. Among adults in Zionsville, ~48% vote Democratic, ~44% Republican, and ~8% don't vote. The map below shows estimated turnout by block group.
How Zionsville compares
Among cities within 25 miles, Zionsville leans more Democratic than 75 of 83 neighbors.
Zionsville runs about 23 points more Democratic than Indiana as a whole. Indiana leans Republican overall, while Zionsville is one of the few Democratic-leaning pockets.
Politics vary noticeably by neighborhood within Zionsville. The east side runs the most Democratic (D+19) and the north side runs the most Republican (R+4), a spread of about 23 points.
Why Zionsville 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 Zionsville, not a ranked or complete list of what matters most.
Zionsville votes against the grain of Indiana. Indiana leans Republican overall, while Zionsville runs about 23 points more Democratic.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Zionsville, 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 Zionsville looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Zionsville 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 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in Zionsville have completed high school, above 97% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Whitestown, IN R+9
- Big Springs, IN R+27
- Westfield, IN R+8
- Carmel, IN D+4
- Fayette, IN R+36
- Williams Creek, IN D+19
- Meridian Hills, IN D+21
- Royalton, IN R+35
- Herr, IN R+46
- Lamong, IN R+22
Cities with Similar Populations
- Hackettstown, NJ R+9
- Mint Hill, NC R+4
- Hixson, TN R+31
- Marshall, TX R+7
- South Bradenton, FL R+8
- Smithtown, NY R+27
- Hillsborough, NC D+28
- Mauldin, SC Even
- Woodway, TX R+30
- Plainview, NY D+5
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.