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

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

Antioch leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.

 

About 79% of adults in Antioch typically vote, above the U.S. average of about 62%. Among adults in Antioch, ~36% vote Democratic, ~43% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.

How Antioch compares

Among cities within 25 miles, Antioch leans more Republican than 72 of 127 neighbors.

Antioch runs about 19 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Antioch is one of the few Republican-leaning pockets.

Politics vary noticeably by neighborhood within Antioch. The northwest side is the most Republican-leaning (R+15) and the southeast side is the least Republican-leaning (R+4), a spread of about 11 points.

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

Antioch votes Republican even though it is densely developed (about 51%, well above the Illinois average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here. Antioch runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.

Preventive-care access and voter turnout

Places with strong routine preventive-care access tend to turn out at a higher rate; Antioch, IL sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.

Why turnout in Antioch looks the way it does

Areas with high high-school completion turn out at higher rates. About 96% of adults in Antioch have completed high school, about 6 points above the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.

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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.