54603 leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 78% of adults in 54603 typically vote, above the U.S. average of about 62%. Among adults in 54603, ~44% vote Democratic, ~34% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How 54603 compares
Among zip codes within 15 miles, 54603 leans more Democratic than 10 of 11 neighbors.
54603 runs about 13 points more Democratic than Wisconsin as a whole. Wisconsin is roughly evenly split, and 54603 sits clearly on the Democratic side.
Politics vary noticeably by block within 54603. The east side runs the most Democratic (D+19) and the north side runs the most Republican (R+5), a spread of about 24 points.
Why 54603 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 54603, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 83% of residents in 54603 live in densely developed areas, about 47 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 42% of adults in 54603 have never been married, above 89% of zip codes. 54603 runs against the grain of Wisconsin, a Democratic-leaning outlier in a roughly evenly split state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 54603, WI sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 54603 looks the way it does
Turnout in 54603 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.