Mountain Glen leans heavily Republican by roughly 50 points: about 25% of voters vote Democratic and 75% Republican.
About 73% of adults in Mountain Glen typically vote, above the U.S. average of about 62%. Among adults in Mountain Glen, ~18% vote Democratic, ~55% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How Mountain Glen compares
Among cities within 25 miles, Mountain Glen leans more Republican than 30 of 77 neighbors.
Mountain Glen runs about 60 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Mountain Glen is one of the few Republican-leaning pockets.
Why Mountain Glen 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 Mountain Glen, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 91% of residents in Mountain Glen drive to work alone, about 17 points above the U.S. average of 74%. Mountain Glen runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; Mountain Glen, IL sits in the bottom tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Mountain Glen looks the way it does
Homeowners vote more often than renters. About 91% of households in Mountain Glen own their home, about 11 points above the Illinois average of 80%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Cobden, IL R+43
- Alto Pass, IL R+50
- Jonesboro, IL R+48
- Anna, IL R+45
- Ware, IL R+56
- Water Valley, IL R+44
- Wolf Lake, IL R+55
- Saratoga, IL R+50
- Pomona, IL R+45
- Makanda, IL D+6
Cities with Similar Populations
- Lehigh, OK R+71
- Stoutsville, MO R+63
- Rexville, WA D+9
- Drifton, FL D+7
- Milan, NY D+19
- East Dickinson, NY R+43
- Thornburg, PA D+18
- Hays, MS R+14
- Ocosta, WA R+30
- Emerson, KY R+70
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.