Mount Vernon leans Republican by roughly 30 points: about 35% of voters vote Democratic and 65% Republican.
About 72% of adults in Mount Vernon typically vote, above the U.S. average of about 62%. Among adults in Mount Vernon, ~25% vote Democratic, ~47% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How Mount Vernon compares
Among cities within 25 miles, Mount Vernon is the least Republican-leaning.
Mount Vernon runs about 41 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Mount Vernon is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Mount Vernon. The northeast side is the most Republican-leaning (R+53) and the south side is the least Republican-leaning (R+21), a spread of about 31 points.
Why Mount Vernon 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 Mount Vernon, not a ranked or complete list of what matters most.
Mount Vernon votes Republican even though it is densely developed (about 55%, well above the Illinois average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here. Mount Vernon runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Mount Vernon, IL sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Mount Vernon looks the way it does
Turnout in Mount Vernon 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
- Summersville, IL R+51
- Idlewood, IL R+46
- Marcoe, IL R+49
- Camp Ground, IL R+60
- Opdyke, IL R+67
- Woodlawn, IL R+57
- Bonnie, IL R+64
- Dix, IL R+59
- Dareville, IL R+61
- Bluford, IL R+68
Cities with Similar Populations
- Sylacauga, AL R+36
- North Myrtle Beach, SC R+30
- Syosset, NY Even
- Pendleton, OR R+29
- Liberal, KS R+25
- Dripping Springs, TX R+18
- Lealman, FL R+4
- Lexington Park, MD D+21
- Lino Lakes, MN R+9
- Mill Creek, WA D+25
All Local Stats
Home Services
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.