Onarga leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 61% of adults in Onarga typically vote, near the U.S. average of about 62%. Among adults in Onarga, ~21% vote Democratic, ~40% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How Onarga compares
Among cities within 25 miles, Onarga is the least Republican-leaning.
Onarga runs about 43 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Onarga is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Onarga. The southeast side is the most Republican-leaning (R+54) and the west side is the least Republican-leaning (R+22), a spread of about 32 points.
Why Onarga 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 Onarga, not a ranked or complete list of what matters most.
Onarga votes against the grain of Illinois. Illinois leans Democratic overall, while Onarga runs about 43 points more Republican. Dense places usually vote Democratic, but Onarga runs against that pattern. Low college attainment predicts Republican voting, and Onarga sits in the bottom quarter (about 12%, below 86% of cities).
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as Onarga, IL does.
Why turnout in Onarga looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Onarga is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Ridgeville, IL R+53
- Gilman, IL R+50
- La Hogue, IL R+54
- Thawville, IL R+53
- Danforth, IL R+59
- Buckley, IL R+53
- Woodworth, IL R+67
- Goodwine, IL R+66
- Crescent City, IL R+53
- Piper City, IL R+39
Cities with Similar Populations
- Mount Victory, OH R+62
- Keene, KY R+36
- Cherrylog, GA R+58
- Zilwaukee, MI R+23
- Creighton, NE R+69
- Cerulean, KY R+62
- Raphine, VA R+48
- May, TX R+72
- Reeders, PA R+8
- Oak Leaf, TX R+14
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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.