Clark County leans Republican by roughly 22 points: about 39% of voters vote Democratic and 61% Republican.
About 71% of adults in Clark County typically vote, above the U.S. average of about 62%. Among adults in Clark County, ~28% vote Democratic, ~43% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How Clark County compares
Among counties within 50 miles, Clark County leans more Republican than 4 of 17 neighbors.
Clark County runs about 10 points more Republican than Ohio as a whole.
Politics vary noticeably by city within Clark County. The south side runs the most Democratic (D+21) and the northwest side runs the most Republican (R+44), a spread of about 64 points.
Why Clark 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 Clark County, not a ranked or complete list of what matters most.
Clark County votes Republican even though it is densely developed (about 63%, well above the Ohio average of 34%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Developed land and Democratic lean
Places with a heavily developed built environment tend to lean Democratic; Clark County, OH sits in the top quarter nationally on this measure. Developed land does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Clark County looks the way it does
Turnout in Clark 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
- Champaign County, OH R+51
- Greene County, OH R+17
- Miami County, OH R+42
- Montgomery County, OH D+6
- Madison County, OH R+39
- Logan County, OH R+51
- Shelby County, OH R+58
- Fayette County, OH R+55
- Union County, OH R+30
- Clinton County, OH R+53
Counties with Similar Populations
- Boone County, KY R+28
- Grayson County, TX R+43
- Humboldt County, CA D+27
- Brunswick County, NC R+29
- Blount County, TN R+49
- Washington County, WI R+28
- Florence County, SC Even
- Hampton City, VA D+41
- Warren County, KY R+16
- Calhoun County, MI R+9
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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.