48640 leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 89% of adults in 48640 typically vote, above the U.S. average of about 62%. Among adults in 48640, ~40% vote Democratic, ~49% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How 48640 compares
Among zip codes within 15 miles, 48640 leans more Republican than 1 of 9 neighbors.
48640 runs about 8 points more Republican than Michigan as a whole.
Politics vary noticeably by block within 48640. The northeast side runs the most Democratic (D+10) and the southwest side runs the most Republican (R+36), a spread of about 45 points.
Why 48640 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 48640. The lean here lands roughly where demographic data alone would predict.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as 48640, MI does.
Why turnout in 48640 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 48640 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 71%, about 11 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in 48640 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.