53139 leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 88% of adults in 53139 typically vote, above the U.S. average of about 62%. Among adults in 53139, ~30% vote Democratic, ~58% Republican, and ~12% don't vote. The map below shows estimated turnout by block group.
How 53139 compares
Among zip codes within 15 miles, 53139 leans more Republican than 16 of 18 neighbors.
53139 runs about 31 points more Republican than Wisconsin as a whole.
Politics vary noticeably by block within 53139. The southeast side is the most Republican-leaning (R+39) and the north side is the least Republican-leaning (R+28), a spread of about 11 points.
Why 53139 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 53139, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 74% of households in 53139 are family households, about 8 points above the U.S. average of 67%.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 53139, WI sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 53139 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 53139 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 70%, about 10 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 89% of households in 53139 own their home, above 85% 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 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.