Clermont County leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 85% of adults in Clermont County typically vote, above the U.S. average of about 62%. Among adults in Clermont County, ~27% vote Democratic, ~58% Republican, and ~15% don't vote. The map below shows estimated turnout by block group.
How Clermont County compares
Among counties within 50 miles, Clermont County leans more Republican than 8 of 23 neighbors.
Clermont County runs about 26 points more Republican than Ohio as a whole.
Politics vary noticeably by city within Clermont County. The northeast side is the most Republican-leaning (R+61) and the northwest side is the least Republican-leaning (R+21), a spread of about 40 points.
Why Clermont 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 Clermont County, not a ranked or complete list of what matters most.
Clermont County votes Republican even though it is densely developed (about 54%, well above the Ohio average of 34%). 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; Clermont County, OH 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 Clermont County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Clermont 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 65%, above 77% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Campbell County, KY R+16
- Hamilton County, OH D+21
- Kenton County, KY R+14
- Brown County, OH R+61
- Warren County, OH R+30
- Butler County, OH R+20
- Boone County, KY R+28
- Pendleton County, KY R+62
- Bracken County, KY R+58
- Clinton County, OH R+53
Counties with Similar Populations
- Harrison County, MS R+18
- Washington County, PA R+24
- Elkhart County, IN R+28
- Muscogee County, GA D+25
- Benton County, WA R+21
- Richmond County, GA D+41
- Champaign County, IL D+29
- Butte County, CA R+3
- Okaloosa County, FL R+34
- York County, ME R+2
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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.