Sanilac County leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 83% of adults in Sanilac County typically vote, above the U.S. average of about 62%. Among adults in Sanilac County, ~22% vote Democratic, ~61% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How Sanilac County compares
Among counties within 50 miles, Sanilac County is the most Republican-leaning.
Sanilac County runs about 45 points more Republican than Michigan as a whole.
Politics vary noticeably by city within Sanilac County. The northwest side is the most Republican-leaning (R+57) and the southeast side is the least Republican-leaning (R+34), a spread of about 24 points.
Why Sanilac 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 Sanilac County, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In Sanilac County, about 92% of residents are non-Hispanic white, about 19 points above the U.S. average of 72%; about 16% of adults hold a bachelor's degree, about 10 points below the Michigan average of 26%.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Sanilac County, MI sits in the bottom quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Sanilac County looks the way it does
Homeowners vote more often than renters. About 83% of households in Sanilac County own their home, about 8 points above the U.S. average of 75%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Lapeer County, MI R+38
- Tuscola County, MI R+42
- St. Clair County, MI R+31
- Huron County, MI R+42
- Genesee County, MI D+8
- Macomb County, MI R+10
- Oakland County, MI D+14
- Bay County, MI R+18
- Saginaw County, MI D+2
- Arenac County, MI R+40
Counties with Similar Populations
- Knox County, ME D+7
- Pasquotank County, NC Even
- Mississippi County, AR R+10
- Wyoming County, NY R+39
- Warren County, VA R+32
- Fayette County, WV R+46
- Amador County, CA R+35
- LaGrange County, IN R+63
- McKean County, PA R+43
- Tazewell County, VA R+58
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.