49104 leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican.
About 39% of adults in 49104 typically vote, below the U.S. average of about 62%. Among adults in 49104, ~26% vote Democratic, ~13% Republican, and ~61% don't vote. The map below shows estimated turnout by block group.
How 49104 compares
Among zip codes within 15 miles, 49104 leans more Democratic than 14 of 15 neighbors.
49104 runs about 36 points more Democratic than Michigan as a whole. Michigan is roughly evenly split, and 49104 sits clearly on the Democratic side.
Why 49104 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 49104, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 79% of adults in 49104 hold a bachelor's degree, about 50 points above the U.S. average of 28%. Density combined with diversity predicts Democratic voting, and non-Hispanic white share in 49104 is about 34%, compared to around 76% in nearby zip codes. A high never-married share predicts Democratic voting, and about 50% of adults in 49104 have never been married, above 95% of zip codes.
Never-married share, developed land, and voter turnout
Places that combine a never-married-heavy adult population and a heavily developed built environment tend to turn out at a lower rate, as 49104, MI does.
Why turnout in 49104 looks the way it does
Renters vote less often than owners. About 66% of households in 49104 rent, about 41 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 4% of homes in 49104 have more than one occupant per room, above 84% of zip codes. Low high-school completion lines up with lower turnout, and about 98% of adults in 49104 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.