Roby leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 83% of adults in Roby typically vote, above the U.S. average of about 62%. Among adults in Roby, ~23% vote Democratic, ~60% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How Roby compares
Among cities within 25 miles, Roby leans more Republican than 29 of 73 neighbors.
Roby runs about 55 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Roby is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Roby. The south side is the most Republican-leaning (R+59) and the west side is the least Republican-leaning (R+33), a spread of about 26 points.
Why Roby 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 Roby, not a ranked or complete list of what matters most.
Roby votes against the grain of Illinois. Illinois leans Democratic overall, while Roby runs about 55 points more Republican.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; Roby, IL sits in the bottom quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Roby looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Roby is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 68%, about 8 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 90% of households in Roby own their home, above 80% of cities. High high-school completion lines up with higher turnout, and about 98% of adults in Roby have completed high school, above 93% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Mechanicsburg, IL R+49
- Edinburg, IL R+53
- Dawson, IL R+46
- Rochester, IL R+27
- New City, IL R+40
- Grove City, IL R+59
- Buffalo, IL R+50
- Clear Lake, IL R+31
- Lanesville, IL R+50
- Mount Auburn, IL R+56
Cities with Similar Populations
- Friley, AR R+62
- Ulm, WY R+71
- Raymar, IA R+29
- Hisel, KY R+68
- Longfellow, PA R+72
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.