48104 is a Democratic stronghold. About 86% of voters here vote Democratic and 14% Republican.
About 76% of adults in 48104 typically vote, above the U.S. average of about 62%. Among adults in 48104, ~65% vote Democratic, ~11% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How 48104 compares
Among zip codes within 15 miles, 48104 is the most Democratic-leaning.
48104 runs about 73 points more Democratic than Michigan as a whole. Michigan is roughly evenly split, and 48104 sits clearly on the Democratic side.
Politics vary noticeably by block within 48104. The northeast side is the most Democratic-leaning (D+81) and the southwest side is the least Democratic-leaning (D+64), a spread of about 16 points.
Why 48104 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 48104, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 79% of adults in 48104 hold a bachelor's degree, about 51 points above the U.S. average of 28%. Dense areas vote Democratic, and 48104 sits in the top fifth on density (about 98%, above 94% of zip codes). 48104 runs against the grain of Michigan, a Democratic-leaning outlier in a roughly evenly split state.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 48104, MI sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 48104 looks the way it does
Areas with high high-school completion turn out at higher rates. About 98% of adults in 48104 have completed high school, about 6 points above the Michigan average of 92%. 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.