Mill Creek is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 60% of adults in Mill Creek typically vote, near the U.S. average of about 62%. Among adults in Mill Creek, ~14% vote Democratic, ~46% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How Mill Creek compares
Among cities within 25 miles, Mill Creek leans more Republican than 30 of 74 neighbors.
Mill Creek runs about 65 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Mill Creek is one of the few Republican-leaning pockets.
Why Mill Creek 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 Mill Creek, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 5% of residents in Mill Creek live in densely developed areas, about 28 points below the Illinois average of 33%. A high white share with below-average college attainment predicts Republican voting, and Mill Creek fits that profile on both counts. Mill Creek runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Mill Creek, IL sits in the bottom 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 Mill Creek looks the way it does
Areas with low high-school completion turn out at lower rates. About 69% of adults in Mill Creek have completed high school, about 21 points below the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Elco, IL R+55
- Dongola, IL R+55
- Wetaug, IL R+44
- Balcom, IL R+56
- Reynoldsville, IL R+56
- Jonesboro, IL R+48
- Ullin, IL R+33
- Anna, IL R+45
- Tamms, IL R+26
- Ware, IL R+56
Cities with Similar Populations
- Kelso, OR R+24
- Sentinel Butte, ND R+69
- Nunam Iqua, AK D+21
- Deer Creek, IN R+62
- Triumph, IL R+40
- Pedro, FL R+47
- Lasker, NC R+36
- Nyman, IA R+53
- Squib, KY R+75
- Stumpy Point, NC R+57
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.