Lake Zurich leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 84% of adults in Lake Zurich typically vote, above the U.S. average of about 62%. Among adults in Lake Zurich, ~46% vote Democratic, ~38% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How Lake Zurich compares
Among cities within 25 miles, Lake Zurich leans more Democratic than 96 of 167 neighbors.
Politically, Lake Zurich sits close to the rest of Illinois.
Politics vary noticeably by neighborhood within Lake Zurich. The southeast side is the most Democratic-leaning (D+16) and the north side is the least Democratic-leaning (D+5), a spread of about 10 points.
Why Lake Zurich 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 Lake Zurich, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 61% of adults in Lake Zurich hold a bachelor's degree, about 33 points above the U.S. average of 28%. Dense areas vote Democratic, and Lake Zurich sits in the top fifth on density (about 88%, above 96% of cities).
Population density and Democratic lean
Places with high population density tend to lean Democratic; Lake Zurich, IL sits in the top tenth nationally on this measure.
Why turnout in Lake Zurich looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Lake Zurich 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 73%, about 13 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Lake Zurich have completed high school, above 87% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Kildeer, IL D+9
- Deer Park, IL D+9
- North Barrington, IL D+6
- Hawthorn Woods, IL D+3
- Barrington, IL D+8
- Long Grove, IL D+14
- Lake Barrington, IL D+6
- Tower Lakes, IL D+7
- Palatine, IL D+19
- Indian Creek, IL D+25
Cities with Similar Populations
- Upper St. Clair, PA D+12
- East Patchogue, NY R+13
- North Plainfield, NJ D+31
- North Tustin, CA R+9
- Florida City, FL D+17
- Clarks Summit, PA Even
- Granite Bay, CA R+11
- Twinsburg, OH D+21
- Covington, WA D+11
- Hampstead, NC R+38
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.