53221 leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 72% of adults in 53221 typically vote, above the U.S. average of about 62%. Among adults in 53221, ~40% vote Democratic, ~32% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How 53221 compares
Among zip codes within 15 miles, 53221 leans more Democratic than 20 of 47 neighbors.
53221 runs about 11 points more Democratic than Wisconsin as a whole.
Politics vary noticeably by block within 53221. The north side runs the most Democratic (D+19) and the southeast side runs the most Republican (Even), a spread of about 20 points.
Why 53221 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 53221, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 53221 live in densely developed areas, about 63 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 37% of adults in 53221 have never been married, above 82% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 53221, WI sits in the top tenth nationally on this measure.
Why turnout in 53221 looks the way it does
Turnout in 53221 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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 Wisconsin Elections Commission, 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.