St. Clair leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 98% of adults in St. Clair typically vote, above the U.S. average of about 62%. Among adults in St. Clair, ~33% vote Democratic, ~65% Republican, and ~2% don't vote. The map below shows estimated turnout by block group.
How St. Clair compares
Among cities within 25 miles, St. Clair leans more Republican than 10 of 43 neighbors.
St. Clair runs about 31 points more Republican than Michigan as a whole.
Politics vary noticeably by neighborhood within St. Clair. The northwest side is the most Republican-leaning (R+48) and the east side is the least Republican-leaning (R+24), a spread of about 24 points.
Why St. Clair leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for St. Clair, not a ranked or complete list of what matters most.
St. Clair votes Republican even though it is densely developed (about 54%, well above the Michigan average of 31%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as St. Clair, MI does.
Why turnout in St. Clair looks the way it does
Areas with strong routine healthcare access turn out at higher rates. St. Clair 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%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- East China, MI R+40
- Marysville, MI R+26
- Rattle Run, MI R+51
- Four Towns, MI R+37
- Anchorville, MI R+47
- Smiths Creek, MI R+41
- Columbus, MI R+48
- Mount Vernon, MI R+50
- Marine City, MI R+32
- Peters, MI R+47
Cities with Similar Populations
- North Logan, UT R+25
- Ellisville, MO Even
- Annapolis Neck, MD D+27
- Strasburg, VA R+42
- Lutherville-Timonium, MD D+21
- Morro Bay, CA D+16
- Sealy, TX R+48
- Montpelier, VT D+42
- Waterford, CA R+30
- North Billerica, MA D+6
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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.