South Streator leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 57% of adults in South Streator typically vote, near the U.S. average of about 62%. Among adults in South Streator, ~17% vote Democratic, ~40% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How South Streator compares
Among cities within 25 miles, South Streator leans more Republican than 30 of 63 neighbors.
South Streator runs about 53 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while South Streator is one of the few Republican-leaning pockets.
Why South Streator 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 South Streator, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 93% of residents in South Streator drive to work alone, about 19 points above the U.S. average of 74%. South Streator runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Housing overcrowding and voter turnout
Places with heavy housing overcrowding tend to turn out at a lower rate; South Streator, IL sits in the top tenth nationally on this measure.
Why turnout in South Streator looks the way it does
Crowded housing lines up with lower turnout. About 10% of homes in South Streator have more than one occupant per room, above 96% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Streator, IL R+21
- Reading, IL R+52
- Kangley, IL R+35
- Kernan, IL R+41
- Ancona, IL R+53
- Blackstone, IL R+52
- Cornell, IL R+55
- Grand Ridge, IL R+42
- Ransom, IL R+42
Cities with Similar Populations
- Horton Bay, MI R+13
- Hintz, WI R+42
- Tyrone, NY R+44
- Kramer, IN R+59
- Harleigh, PA R+40
- Canadohta Lake, PA R+60
- McKinstry Hollow, NY R+43
- South Butler, NY R+43
- Hawleyville, IA R+56
- Barney, ND R+47
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.