St. Johns is a Republican stronghold. About 24% of voters here vote Democratic and 76% Republican.
About 71% of adults in St. Johns typically vote, above the U.S. average of about 62%. Among adults in St. Johns, ~17% vote Democratic, ~54% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How St. Johns compares
Among cities within 25 miles, St. Johns leans more Republican than 34 of 84 neighbors.
St. Johns runs about 62 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while St. Johns is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within St. Johns. The southeast side is the most Republican-leaning (R+61) and the east side is the least Republican-leaning (R+39), a spread of about 22 points.
Why St. Johns 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 St. Johns, not a ranked or complete list of what matters most.
St. Johns votes against the grain of Illinois. Illinois leans Democratic overall, while St. Johns runs about 62 points more Republican. Car-dependent areas vote Republican, and about 85% of residents in St. Johns drive to work alone, above 82% of cities.
Local retail density and voter turnout
Places with dense local retail within a mile tend to turn out at a higher rate; St. Johns, IL sits in the top tenth nationally on this measure. Nearby retail does not change how people vote; it reflects how urban and built-up a place is.
Why turnout in St. Johns looks the way it does
Turnout in St. Johns sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Du Quoin, IL R+42
- Old Du Quoin, IL R+50
- Sunfield, IL R+50
- Dowell, IL R+54
- Tamaroa, IL R+56
- Elkville, IL R+56
- Pinckneyville, IL R+50
- Hallidayboro, IL R+56
- North City, IL R+54
- Mulkeytown, IL R+57
Cities with Similar Populations
- Homets Ferry, PA R+60
- Bruce, IL R+57
- South Bethany, DE D+11
- Graveston, TN R+65
- Penrod, KY R+67
- West Laramie, WY R+37
- Westfield, ME R+40
- Jacksonville, MO R+68
- Nipgen, OH R+62
- Stoughstown, PA R+51
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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.