Winnetka, IL Political Map | Democrat & Republican Areas in Winnetka

By the BestNeighborhood data science team. Last updated May 2026.

Winnetka leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.

 

About 98% of adults in Winnetka typically vote, above the U.S. average of about 62%. Among adults in Winnetka, ~67% vote Democratic, ~31% Republican, and ~2% don't vote. The map below shows estimated turnout by block group.

How Winnetka compares

Among cities within 25 miles, Winnetka leans more Democratic than 105 of 124 neighbors.

Winnetka runs about 25 points more Democratic than Illinois as a whole.

Why Winnetka 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 Winnetka, not a ranked or complete list of what matters most.

Areas with high college attainment vote Democratic. About 87% of adults in Winnetka hold a bachelor's degree, about 59 points above the U.S. average of 28%. Dense areas vote Democratic, and Winnetka sits in the top fifth on density (about 88%, above 96% of cities).

Preventive-care access and voter turnout

Places with strong routine preventive-care access tend to turn out at a higher rate; Winnetka, IL sits in the top tenth 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 Winnetka looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Winnetka 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 77%, about 17 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 92% of households in Winnetka own their home, about 17 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and more than 99% of adults in Winnetka have completed high school, in the top fraction of cities. Learn more about the findings and methodology on the political spectrum map.

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Sources and methodology

Precinct-level voting records used to fit the model come from Illinois State Board of Elections, 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.