Montgomery County leans slightly Democratic by roughly 6 points: about 53% of voters vote Democratic and 47% Republican.
About 74% of adults in Montgomery County typically vote, above the U.S. average of about 62%. Among adults in Montgomery County, ~39% vote Democratic, ~35% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Montgomery County compares
Among counties within 50 miles, Montgomery County leans more Democratic than 17 of 18 neighbors.
Montgomery County runs about 17 points more Democratic than Ohio as a whole. Ohio leans Republican overall, while Montgomery County is one of the few Democratic-leaning pockets.
Politics vary noticeably by city within Montgomery County. The west side runs the most Democratic (D+44) and the southwest side runs the most Republican (R+30), a spread of about 74 points.
Why Montgomery 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 Montgomery County, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 85% of residents in Montgomery County live in densely developed areas, about 49 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Montgomery County sits in the top quarter (about 31%, above 78% of counties). A high never-married share predicts Democratic voting, and about 35% of adults in Montgomery County have never been married, above 83% of counties.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Montgomery County, OH sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Montgomery County looks the way it does
Turnout in Montgomery 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
- Greene County, OH R+17
- Miami County, OH R+42
- Preble County, OH R+58
- Warren County, OH R+30
- Clark County, OH R+21
- Butler County, OH R+20
- Clinton County, OH R+53
- Darke County, OH R+61
- Champaign County, OH R+51
- Union County, IN R+58
Counties with Similar Populations
- Spokane County, WA R+3
- Chester County, PA D+14
- Summit County, OH D+10
- Guilford County, NC D+30
- Plymouth County, MA D+11
- Greenville County, SC R+14
- Passaic County, NJ D+4
- Sedgwick County, KS R+7
- Camden County, NJ D+30
- Ramsey County, MN D+43
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.