Butler County leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 74% of adults in Butler County typically vote, above the U.S. average of about 62%. Among adults in Butler County, ~30% vote Democratic, ~45% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How Butler County compares
Among counties within 50 miles, Butler County leans more Republican than 5 of 23 neighbors.
Butler County runs about 9 points more Republican than Ohio as a whole.
Politics vary noticeably by city within Butler County. The northwest side runs the most Democratic (D+9) and the north side runs the most Republican (R+55), a spread of about 64 points.
Why Butler 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 Butler County, not a ranked or complete list of what matters most.
Butler County votes Republican even though it is densely developed (about 78%, far above the Ohio average of 34%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Butler County, OH sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Butler County looks the way it does
Turnout in Butler 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
- Warren County, OH R+30
- Hamilton County, OH D+21
- Preble County, OH R+58
- Clermont County, OH R+37
- Campbell County, KY R+16
- Union County, IN R+58
- Kenton County, KY R+14
- Montgomery County, OH D+6
- Dearborn County, IN R+53
- Franklin County, IN R+63
Counties with Similar Populations
- Osceola County, FL Even
- Madison County, AL R+5
- Mercer County, NJ D+38
- Allen County, IN R+5
- Orleans Parish, LA D+63
- Lake County, FL R+25
- Lane County, OR D+21
- Forsyth County, NC D+18
- Pulaski County, AR D+28
- Manatee County, FL R+15
Sources and methodology
Precinct-level voting records used to fit the model come from Ohio 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.