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

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

Westchester leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican.

 

About 73% of adults in Westchester typically vote, above the U.S. average of about 62%. Among adults in Westchester, ~49% vote Democratic, ~24% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.

How Westchester compares

Among cities within 25 miles, Westchester leans more Democratic than 136 of 171 neighbors.

Westchester runs about 23 points more Democratic than Illinois as a whole.

Politics vary noticeably by neighborhood within Westchester. The north side is the most Democratic-leaning (D+51) and the southwest side is the least Democratic-leaning (D+22), a spread of about 29 points.

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

Dense areas vote Democratic. About 93% of residents in Westchester live in densely developed areas, about 57 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Westchester sits in the top quarter (about 42%, above 89% of cities).

Paved land cover and Democratic lean

Places with extensive paved surfaces tend to lean Democratic; Westchester, IL sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.

Why turnout in Westchester looks the way it does

Turnout in Westchester 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.

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.