Delaware County, OH Political Map | Democrat & Republican Areas in Delaware County

By the BestNeighborhood data science team. Last updated May 2026.

Delaware County leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican.

 

About 90% of adults in Delaware County typically vote, above the U.S. average of about 62%. Among adults in Delaware County, ~42% vote Democratic, ~48% Republican, and ~10% don't vote. The map below shows estimated turnout by block group.

How Delaware County compares

Among counties within 50 miles, Delaware County leans more Republican than 1 of 16 neighbors.

Delaware County runs about 6 points more Democratic than Ohio as a whole.

Politics vary noticeably by city within Delaware County. The south side runs the most Democratic (D+11) and the northeast side runs the most Republican (R+40), a spread of about 52 points.

Why Delaware 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 Delaware County, not a ranked or complete list of what matters most.

Delaware County votes Republican even though it is densely developed (about 67%, far above the Ohio average of 34%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 77% of households in Delaware County are family households, above 97% of counties.

Food insecurity and voter turnout

Places with low food insecurity tend to turn out at a higher rate; Delaware County, OH sits in the bottom tenth nationally on this measure. Food insecurity does not directly drive turnout; it reflects economic hardship, which lines up with lower voting.

Why turnout in Delaware County looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Delaware 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 75%, about 15 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 81% of households in Delaware County own their home, above 83% of counties. High high-school completion lines up with higher turnout, and about 97% of adults in Delaware County have completed high school, in the top fraction of counties. Learn more about the findings and methodology on the political spectrum map.

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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.