Round Lake leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 69% of adults in Round Lake typically vote, above the U.S. average of about 62%. Among adults in Round Lake, ~39% vote Democratic, ~30% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How Round Lake compares
Among cities within 25 miles, Round Lake leans more Democratic than 96 of 139 neighbors.
Politically, Round Lake sits close to the rest of Illinois.
Politics vary noticeably by neighborhood within Round Lake. The east side is the most Democratic-leaning (D+19) and the south side is the least Democratic-leaning (D+4), a spread of about 15 points.
Why Round Lake 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, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 62% of residents in Round Lake live in densely developed areas, about 26 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Round Lake sits in the top quarter (about 39%, above 86% of cities).
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Round Lake, 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 Round Lake looks the way it does
Turnout in Round Lake 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.
Nearby Cities
- Round Lake Park, IL D+16
- Hainesville, IL D+18
- Round Lake Beach, IL D+16
- Round Lake Heights, IL D+7
- Volo, IL Even
- Ingleside, IL R+5
- Grayslake, IL D+21
- Venetian Village, IL D+6
- Lakemoor, IL R+12
- Lake Villa, IL Even
Cities with Similar Populations
- Bloomingdale, IL Even
- Bonaire, GA R+18
- Nipomo, CA R+10
- Willow Grove, PA D+28
- Heber City, UT R+34
- Burlington, WI R+18
- Broadview Heights, OH R+6
- Canyon, TX R+52
- Suitland, MD D+86
- Secaucus, NJ D+8
All Local Stats
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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.