48304 leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 95% of adults in 48304 typically vote, above the U.S. average of about 62%. Among adults in 48304, ~52% vote Democratic, ~43% Republican, and ~5% don't vote. The map below shows estimated turnout by block group.
How 48304 compares
Among zip codes within 15 miles, 48304 leans more Democratic than 36 of 77 neighbors.
48304 runs about 11 points more Democratic than Michigan as a whole.
Politics vary noticeably by block within 48304. The northwest side runs the most Democratic (D+24) and the southwest side runs the most Republican (R+7), a spread of about 31 points.
Why 48304 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 48304, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 76% of adults in 48304 hold a bachelor's degree, about 48 points above the U.S. average of 28%. Dense areas vote Democratic, and 48304 sits in the top fifth on density (about 97%, above 93% of zip codes).
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; 48304, MI sits in the top tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 48304 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 48304 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 80%, about 20 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 89% of households in 48304 own their home, compared to around 72% in nearby zip codes. High high-school completion lines up with higher turnout, and about 98% of adults in 48304 have completed high school, above 95% 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.