Herrin leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 73% of adults in Herrin typically vote, above the U.S. average of about 62%. Among adults in Herrin, ~24% vote Democratic, ~49% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How Herrin compares
Among cities within 25 miles, Herrin leans more Republican than 12 of 87 neighbors.
Herrin runs about 46 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Herrin is one of the few Republican-leaning pockets.
Why Herrin 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 Herrin, not a ranked or complete list of what matters most.
Herrin votes Republican even though it is densely developed (about 60%, well above the Illinois average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here. Herrin runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Herrin, IL sits in the top quarter nationally on this measure.
Why turnout in Herrin looks the way it does
Turnout in Herrin 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
- Energy, IL R+34
- Colp, IL R+43
- Carterville, IL R+25
- Crainville, IL R+19
- Freeman Spur, IL R+53
- Cambria, IL R+34
- Johnston City, IL R+42
- Whiteash, IL R+51
- Bush, IL R+50
Cities with Similar Populations
- Woodmere, NY R+56
- Falmouth, ME D+31
- Newport East, RI D+15
- Punxsutawney, PA R+51
- Clay, AL R+5
- Highland City, FL R+29
- Damascus, OR R+6
- Brandon, SD R+28
- Guttenberg, NJ D+20
- Lansdowne, VA D+23
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.