Port Huron leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 70% of adults in Port Huron typically vote, above the U.S. average of about 62%. Among adults in Port Huron, ~32% vote Democratic, ~39% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How Port Huron compares
Among cities within 25 miles, Port Huron is the least Republican-leaning.
Port Huron runs about 8 points more Republican than Michigan as a whole.
Politics vary noticeably by neighborhood within Port Huron. The east side runs the most Democratic (Even) and the northwest side runs the most Republican (R+21), a spread of about 23 points.
Why Port Huron 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 Port Huron, not a ranked or complete list of what matters most.
Port Huron votes Republican even though it is densely developed (about 82%, far above the Michigan average of 31%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Port Huron, MI sits in the top tenth nationally on this measure.
Why turnout in Port Huron looks the way it does
Turnout in Port Huron 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 Cities
- Marysville, MI R+26
- Smiths Creek, MI R+41
- Fort Gratiot, MI R+25
- North Street, MI R+38
- Thornton, MI R+45
- St. Clair, MI R+33
- Lakeport, MI R+36
- Ruby, MI R+47
- Rattle Run, MI R+51
- Goodells, MI R+49
Cities with Similar Populations
- Old Bridge, NJ R+14
- Estero, FL R+26
- New Smyrna Beach, FL R+29
- Bell Gardens, CA D+36
- South Valley, NM D+18
- Keizer, OR D+2
- Calhoun, GA R+54
- Vicksburg, MS D+13
- Hillsborough, NJ D+8
- Security-Widefield, CO R+10
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.