49103 leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 67% of adults in 49103 typically vote, near the U.S. average of about 62%. Among adults in 49103, ~37% vote Democratic, ~30% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How 49103 compares
Among zip codes within 15 miles, 49103 leans more Democratic than 13 of 15 neighbors.
49103 runs about 12 points more Democratic than Michigan as a whole.
Politics vary noticeably by block within 49103. The north side runs the most Democratic (D+34) and the southeast side runs the most Republican (R+18), a spread of about 52 points.
Why 49103 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 49103, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 55% of adults in 49103 hold a bachelor's degree, about 27 points above the U.S. average of 28%. A high never-married share predicts Democratic voting, and about 34% of adults in 49103 have never been married, above 77% of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 49103, MI sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 49103 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 49103 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 67%, about 7 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in 49103 have completed high school, above 81% of zip codes. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.