Delavan leans slightly Republican by roughly 12 points: about 44% of voters vote Democratic and 56% Republican.
About 77% of adults in Delavan typically vote, above the U.S. average of about 62%. Among adults in Delavan, ~34% vote Democratic, ~43% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How Delavan compares
Among cities within 25 miles, Delavan leans more Republican than 11 of 86 neighbors.
Delavan runs about 12 points more Republican than Wisconsin as a whole.
Politics vary noticeably by neighborhood within Delavan. The northwest side is the most Republican-leaning (R+31) and the east side is the least Republican-leaning (R+7), a spread of about 24 points.
Why Delavan leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Delavan, not a ranked or complete list of what matters most.
Delavan votes Republican even though it is densely developed (about 56%, far above the Wisconsin average of 24%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Delavan, WI sits in the top quarter nationally on this measure.
Why turnout in Delavan looks the way it does
Turnout in Delavan 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 Cities
- Delavan Lake, WI R+22
- Inlet, WI R+29
- Darien, WI R+35
- Fairfield, WI R+36
- Millard, WI R+37
- Elkhorn, WI R+22
- Williams Bay, WI R+11
- Honey Creek, WI R+36
- Fontana-on-Geneva Lake, WI R+2
- Walworth, WI R+18
Cities with Similar Populations
- Moseley, VA R+9
- Endwell, NY D+7
- Lower Burrell, PA R+25
- Winston, GA R+30
- Central, SC R+31
- Totowa, NJ R+27
- Troutman, NC R+36
- Canyon Lake, CA R+24
- Wallingford, PA D+30
- New London, WI R+33
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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.