Boone County leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 84% of adults in Boone County typically vote, above the U.S. average of about 62%. Among adults in Boone County, ~34% vote Democratic, ~49% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How Boone County compares
Among counties within 50 miles, Boone County leans more Republican than 3 of 17 neighbors.
Politically, Boone County sits close to the rest of Indiana.
Politics vary noticeably by city within Boone County. The southeast side runs the most Democratic (D+4) and the northeast side runs the most Republican (R+52), a spread of about 56 points.
Why Boone 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 Boone County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 72% of households in Boone County are family households, about 6 points above the U.S. average of 67%. Dense places usually vote Democratic, but Boone County runs against that pattern.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Boone County, IN sits in the top tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Boone County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Boone 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 70%, about 10 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 80% of households in Boone County own their home, above 80% of counties. High high-school completion lines up with higher turnout, and about 94% of adults in Boone County have completed high school, above 88% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Hendricks County, IN R+20
- Hamilton County, IN R+5
- Marion County, IN D+29
- Clinton County, IN R+45
- Tipton County, IN R+52
- Montgomery County, IN R+44
- Hancock County, IN R+36
- Morgan County, IN R+51
- Johnson County, IN R+35
- Putnam County, IN R+46
Counties with Similar Populations
- Lewis and Clark County, MT R+7
- Franklin County, MA D+22
- Portage County, WI R+7
- Surry County, NC R+52
- Greene County, TN R+62
- York County, VA R+3
- DeKalb County, AL R+71
- Iberia Parish, LA R+24
- Ward County, ND R+32
- Creek County, OK R+55
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.