Round Lake Heights leans slightly Democratic by roughly 8 points: about 54% of voters vote Democratic and 46% Republican.
About 61% of adults in Round Lake Heights typically vote, near the U.S. average of about 62%. Among adults in Round Lake Heights, ~33% vote Democratic, ~28% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How Round Lake Heights compares
Among cities within 25 miles, Round Lake Heights leans more Democratic than 85 of 134 neighbors.
Politically, Round Lake Heights sits close to the rest of Illinois.
Politics vary noticeably by neighborhood within Round Lake Heights. The east side runs the most Democratic (D+20) and the northeast side runs the most Republican (Even), a spread of about 22 points.
Why Round Lake 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 Round Lake Heights, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 63% of residents in Round Lake Heights live in densely developed areas, about 27 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Round Lake Heights sits in the top quarter (about 36%, above 83% of cities).
Population density and Democratic lean
Places with high population density tend to lean Democratic; Round Lake Heights, IL sits in the top tenth nationally on this measure.
Why turnout in Round Lake Heights looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Round Lake Heights is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Round Lake Beach, IL D+16
- Ingleside, IL R+5
- Lake Villa, IL Even
- Venetian Village, IL D+6
- Round Lake, IL D+12
- Hainesville, IL D+18
- Round Lake Park, IL D+16
- Grayslake, IL D+21
- Fox Lake, IL R+11
- Lindenhurst, IL D+4
Cities with Similar Populations
- Zellwood, FL R+31
- Gurdon, AR R+24
- Belle Plaine, IA R+30
- Duquesne, MO R+39
- Pleasantville, OH R+55
- Carlisle, AR R+64
- Neoga, IL R+57
- Rio Vista, TX R+71
- Baird, TX R+70
- Sullivans Island, SC R+11
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.