48340 leans heavily Democratic by roughly 38 points: about 69% of voters vote Democratic and 31% Republican.
About 57% of adults in 48340 typically vote, near the U.S. average of about 62%. Among adults in 48340, ~39% vote Democratic, ~18% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How 48340 compares
Among zip codes within 15 miles, 48340 leans more Democratic than 50 of 57 neighbors.
48340 runs about 40 points more Democratic than Michigan as a whole. Michigan is roughly evenly split, and 48340 sits clearly on the Democratic side.
Politics vary noticeably by block within 48340. The southeast side is the most Democratic-leaning (D+53) and the north side is the least Democratic-leaning (D+17), a spread of about 35 points.
Why 48340 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 48340, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 91% of residents in 48340 live in densely developed areas, about 55 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 50% of adults in 48340 have never been married, above 95% of zip codes. 48340 runs against the grain of Michigan, a Democratic-leaning outlier in a roughly evenly split state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 48340, MI sits in the top quarter nationally on this measure.
Why turnout in 48340 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 48340 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 53% of households in 48340 rent, compared to around 30% in nearby zip codes. High food insecurity lines up with lower turnout, and about 31% of adults in 48340 report food insecurity, 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.