Oakland County leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.
About 85% of adults in Oakland County typically vote, above the U.S. average of about 62%. Among adults in Oakland County, ~49% vote Democratic, ~37% Republican, and ~14% don't vote. The map below shows estimated turnout by block group.
How Oakland County compares
Among counties within 50 miles, Oakland County leans more Democratic than 7 of 9 neighbors.
Oakland County runs about 15 points more Democratic than Michigan as a whole. Michigan is roughly evenly split, and Oakland County sits clearly on the Democratic side.
Politics vary noticeably by city within Oakland County. The south side runs the most Democratic (D+57) and the northwest side runs the most Republican (R+18), a spread of about 76 points.
Why Oakland 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 Oakland County, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 51% of adults in Oakland County hold a bachelor's degree, about 23 points above the U.S. average of 28%. Dense areas vote Democratic, and Oakland County sits in the top fifth on density (about 85%, above 97% of counties). Oakland County runs against the grain of Michigan, a Democratic-leaning outlier in a roughly evenly split state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Oakland County, MI sits in the top tenth nationally on this measure.
Why turnout in Oakland County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Oakland 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 73%, about 13 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 95% of adults in Oakland County have completed high school, above 92% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Macomb County, MI R+10
- Wayne County, MI D+33
- Livingston County, MI R+23
- Washtenaw County, MI D+44
- Lapeer County, MI R+38
- Genesee County, MI D+8
- St. Clair County, MI R+31
- Monroe County, MI R+27
- Shiawassee County, MI R+27
- Tuscola County, MI R+42
Counties with Similar Populations
- Hennepin County, MN D+43
- Cuyahoga County, OH D+35
- Travis County, TX D+37
- Allegheny County, PA D+22
- Franklin County, OH D+30
- Salt Lake County, UT D+10
- Contra Costa County, CA D+36
- Nassau County, NY Even
- Fairfax County, VA D+37
- Wake County, NC D+28
Sources and methodology
Precinct-level voting records used to fit the model come from Michigan Department 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.