48003 leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About more than 99% of adults in 48003 typically vote, above the U.S. average of about 62%. Among adults in 48003, ~31% vote Democratic, ~69% Republican, and ~0% don't vote. The map below shows estimated turnout by block group.
How 48003 compares
Among zip codes within 15 miles, 48003 leans more Republican than 8 of 18 neighbors.
48003 runs about 36 points more Republican than Michigan as a whole.
Politics vary noticeably by block within 48003. The southwest side is the most Republican-leaning (R+49) and the south side is the least Republican-leaning (R+28), a spread of about 21 points.
Why 48003 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 48003, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 74% of households in 48003 are family households, about 8 points above the U.S. average of 67%.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; 48003, MI sits in the top tenth nationally on this measure.
Why turnout in 48003 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 48003 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 70%, about 10 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 93% of households in 48003 own their home, about 18 points above the U.S. average of 75%. 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.