Sister Bay leans Democratic by roughly 24 points: about 62% of voters vote Democratic and 38% Republican.
About 92% of adults in Sister Bay typically vote, above the U.S. average of about 62%. Among adults in Sister Bay, ~57% vote Democratic, ~35% Republican, and ~8% don't vote. The map below shows estimated turnout by block group.
How Sister Bay compares
Among cities within 25 miles, Sister Bay is the most Democratic-leaning.
Sister Bay runs about 25 points more Democratic than Wisconsin as a whole. Wisconsin is roughly evenly split, and Sister Bay sits clearly on the Democratic side.
Politics vary noticeably by neighborhood within Sister Bay. The west side is the most Democratic-leaning (D+28) and the southeast side is the least Democratic-leaning (D+13), a spread of about 16 points.
Why Sister Bay 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 Sister Bay, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 50% of adults in Sister Bay hold a bachelor's degree, about 21 points above the U.S. average of 28%. Sister Bay runs against the grain of Wisconsin, a Democratic-leaning outlier in a roughly evenly split state.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Sister Bay, WI sits in the top tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Sister Bay looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Sister Bay 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 73%, about 13 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 99% of adults in Sister Bay have completed high school, above 97% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Ephraim, WI D+23
- Rowleys Bay, WI D+14
- Ellison Bay, WI D+14
- Fish Creek, WI D+22
- Gills Rock, WI D+14
- Baileys Harbor, WI D+8
- Egg Harbor, WI D+4
- Jacksonport, WI R+3
- Washington Island, WI D+14
- Valmy, WI D+3
Cities with Similar Populations
- Earle, AR D+50
- Gallatin Gateway, MT Even
- Newville, AL R+52
- Porter Corners, NY R+20
- Elkton, FL R+51
- Logansport, LA R+45
- Lancing, TN R+73
- Rozet, WY R+83
- Rockfield, KY R+51
- Point Marion, PA R+49
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.