Marion County leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 69% of adults in Marion County typically vote, above the U.S. average of about 62%. Among adults in Marion County, ~23% vote Democratic, ~46% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How Marion County compares
Among counties within 50 miles, Marion County leans more Republican than 6 of 17 neighbors.
Marion County runs about 23 points more Republican than Ohio as a whole.
Politics vary noticeably by city within Marion County. The northwest side is the most Republican-leaning (R+58) and the north side is the least Republican-leaning (R+14), a spread of about 43 points.
Why Marion 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 Marion County, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 82% of residents in Marion County drive to work alone, about 9 points above the U.S. average of 74%. Low college attainment predicts Republican voting, and Marion County sits in the bottom quarter (about 14%, below 90% of counties).
Housing overcrowding and voter turnout
Places with low overcrowding tend to turn out at a higher rate; Marion County, OH sits in the bottom quarter nationally on this measure.
Why turnout in Marion County looks the way it does
Turnout in Marion 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
- Morrow County, OH R+58
- Crawford County, OH R+51
- Wyandot County, OH R+53
- Union County, OH R+30
- Delaware County, OH R+5
- Hardin County, OH R+50
- Richland County, OH R+27
- Logan County, OH R+51
- Knox County, OH R+48
- Seneca County, OH R+35
Counties with Similar Populations
- Walker County, AL R+72
- Clay County, MN R+3
- Kershaw County, SC R+32
- Liberty County, GA D+16
- Jefferson County, OH R+35
- Lincoln County, SD R+29
- Armstrong County, PA R+52
- Chaves County, NM R+37
- Pulaski County, KY R+59
- Mason County, WA R+5
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.