Vanderburgh County leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 64% of adults in Vanderburgh County typically vote, near the U.S. average of about 62%. Among adults in Vanderburgh County, ~29% vote Democratic, ~35% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How Vanderburgh County compares
Among counties within 50 miles, Vanderburgh County is the least Republican-leaning.
Vanderburgh County runs about 10 points more Democratic than Indiana as a whole.
Politics vary noticeably by city within Vanderburgh County. The south side runs the most Democratic (D+35) and the northwest side runs the most Republican (R+28), a spread of about 64 points.
Why Vanderburgh 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 Vanderburgh County, not a ranked or complete list of what matters most.
Vanderburgh County votes Republican even though it is densely developed (about 78%, far above the Indiana average of 25%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Vanderburgh County, IN sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Vanderburgh County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Vanderburgh 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 61%, above 57% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Warrick County, IN R+33
- Henderson County, KY R+33
- Posey County, IN R+45
- Gibson County, IN R+49
- Spencer County, IN R+49
- Daviess County, KY R+31
- Union County, KY R+56
- Wabash County, IL R+51
- Pike County, IN R+55
- Webster County, KY R+58
Counties with Similar Populations
- Washington County, UT R+51
- Johnson County, TX R+50
- Imperial County, CA Even
- Kanawha County, WV R+19
- Shawnee County, KS D+4
- Licking County, OH R+29
- Peoria County, IL D+14
- Ulster County, NY D+16
- Kent County, DE D+5
- Shasta County, CA R+30
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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.