Ottawa County leans Republican by roughly 30 points: about 35% of voters vote Democratic and 65% Republican.
About 89% of adults in Ottawa County typically vote, above the U.S. average of about 62%. Among adults in Ottawa County, ~31% vote Democratic, ~58% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How Ottawa County compares
Among counties within 50 miles, Ottawa County leans more Republican than 4 of 9 neighbors.
Ottawa County runs about 18 points more Republican than Ohio as a whole.
Politics vary noticeably by city within Ottawa County. The north side is the most Republican-leaning (R+40) and the east side is the least Republican-leaning (R+21), a spread of about 18 points.
Why Ottawa County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Ottawa County. The lean here lands roughly where demographic data alone would predict.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Ottawa County, OH sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Ottawa County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Ottawa 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 66%, about 6 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 84% of households in Ottawa County own their home, above 94% of counties. High high-school completion lines up with higher turnout, and about 94% of adults in Ottawa County have completed high school, above 87% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Sandusky County, OH R+33
- Erie County, OH R+13
- Wood County, OH R+11
- Seneca County, OH R+35
- Lucas County, OH D+17
- Monroe County, MI R+27
- Huron County, OH R+44
- Hancock County, OH R+32
- Wyandot County, OH R+53
- Lorain County, OH R+5
Counties with Similar Populations
- Rio Arriba County, NM D+20
- Orleans County, NY R+32
- Delaware County, OK R+58
- Pike County, MS D+8
- Tazewell County, VA R+58
- McKean County, PA R+43
- LaGrange County, IN R+63
- Amador County, CA R+35
- Fayette County, WV R+46
- Wyoming County, NY R+39
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.