Mark leans Republican by roughly 30 points: about 35% of voters vote Democratic and 65% Republican.
About 79% of adults in Mark typically vote, above the U.S. average of about 62%. Among adults in Mark, ~28% vote Democratic, ~51% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.
How Mark compares
Among cities within 25 miles, Mark leans more Republican than 20 of 71 neighbors.
Mark runs about 40 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Mark is one of the few Republican-leaning pockets.
Why Mark 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 Mark, not a ranked or complete list of what matters most.
Mark votes against the grain of Illinois. Illinois leans Democratic overall, while Mark runs about 40 points more Republican. Car-dependent areas vote Republican, and about 85% of residents in Mark drive to work alone, above 83% of cities.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Mark, IL sits below the national average on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Mark looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in Mark 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.
Nearby Cities
- Granville, IL R+19
- Standard, IL R+32
- Hennepin, IL R+30
- Spring Valley, IL R+9
- DePue, IL D+2
- Bureau Junction, IL R+26
- Cedar Point, IL R+17
- Seatonville, IL R+28
- McNabb, IL R+35
- Dalzell, IL R+22
Cities with Similar Populations
- Harpertown, WV R+56
- Falling Water, TN R+41
- Cold Spring, PA R+47
- Ballico, CA R+39
- Apple Valley, UT R+65
- Lowry, MN R+43
- Coalton, OH R+63
- Sale City, GA R+61
- Belton, KY R+64
- Ridott, IL R+44
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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.