Sepo leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 82% of adults in Sepo typically vote, above the U.S. average of about 62%. Among adults in Sepo, ~22% vote Democratic, ~60% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Sepo compares
Among cities within 25 miles, Sepo leans more Republican than 24 of 57 neighbors.
Sepo runs about 58 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Sepo is one of the few Republican-leaning pockets.
Why Sepo 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 Sepo, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 93% of residents in Sepo drive to work alone, about 19 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 81% of households in Sepo are family households, above 91% of cities. Sepo runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; Sepo, IL sits in the top quarter nationally on this measure.
Why turnout in Sepo looks the way it does
Homeowners vote more often than renters. About 90% of households in Sepo own their home, about 10 points above the Illinois average of 80%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Lewistown, IL R+41
- Havana, IL R+40
- Little America, IL R+47
- Enion, IL R+58
- Eckard, IL R+49
- Bryant, IL R+43
- Maples Mill, IL R+46
- Matanzas Beach, IL R+56
- Liverpool, IL R+46
- Ipava, IL R+50
Cities with Similar Populations
- Mariasville, PA R+57
- Dover, ND R+60
- Daysville, KY R+51
- South Andover, ME R+30
- Saxon, WA Even
- Enning, SD R+83
- Salt Flat, TX R+36
- Ruby, WA R+46
- Creelsboro, KY R+75
- Craige, WA R+49
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.