Prospect Heights leans slightly Democratic by roughly 8 points: about 54% of voters vote Democratic and 46% Republican.
About 60% of adults in Prospect Heights typically vote, near the U.S. average of about 62%. Among adults in Prospect Heights, ~32% vote Democratic, ~27% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How Prospect Heights compares
Among cities within 25 miles, Prospect Heights leans more Democratic than 68 of 168 neighbors.
Politically, Prospect Heights sits close to the rest of Illinois.
Politics vary noticeably by neighborhood within Prospect Heights. The southeast side runs the most Democratic (D+16) and the south side runs the most Republican (Even), a spread of about 17 points.
Why Prospect Heights 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 Prospect Heights, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Prospect Heights live in densely developed areas, about 63 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Prospect Heights sits in the top quarter (about 41%, above 88% of cities).
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Prospect Heights, IL sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Prospect Heights looks the way it does
Renters vote less often than owners. About 37% of households in Prospect Heights rent, about 12 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 8% of homes in Prospect Heights have more than one occupant per room, above 95% of cities. Low high-school completion lines up with lower turnout, and about 82% of adults in Prospect Heights have completed high school, below 87% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Wheeling, IL D+15
- Mount Prospect, IL D+12
- Arlington Heights, IL D+19
- Northbrook, IL D+32
- Glenview Nas, IL D+26
- Des Plaines, IL D+7
- Buffalo Grove, IL D+25
- Riverwoods, IL D+29
- Deerfield, IL D+45
- Glenview, IL D+21
Cities with Similar Populations
- Valle Vista, CA R+15
- Fort Thomas, KY Even
- Denville, NJ Even
- Merrill, WI R+27
- Bethlehem, GA R+32
- Quincy, FL D+45
- Wauconda, IL Even
- Eureka, MO R+25
- Grand Ledge, MI R+4
- Whitewater, WI Even
All Local Stats
Home Services
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.