Logan County leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 70% of adults in Logan County typically vote, above the U.S. average of about 62%. Among adults in Logan County, ~20% vote Democratic, ~50% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How Logan County compares
Among counties within 50 miles, Logan County leans more Republican than 9 of 12 neighbors.
Logan County runs about 52 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Logan County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Logan County. The east side is the most Republican-leaning (R+58) and the west side is the least Republican-leaning (R+32), a spread of about 26 points.
Why Logan County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Logan County, not a ranked or complete list of what matters most.
Logan County votes against the grain of Illinois. Illinois leans Democratic overall, while Logan County runs about 52 points more Republican.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; Logan County, IL sits in the top quarter nationally on this measure.
Why turnout in Logan County looks the way it does
Turnout in Logan County sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- De Witt County, IL R+43
- Menard County, IL R+41
- Macon County, IL R+8
- Sangamon County, IL Even
- Mason County, IL R+46
- McLean County, IL D+5
- Tazewell County, IL R+29
- Piatt County, IL R+35
- Christian County, IL R+45
- Woodford County, IL R+40
Counties with Similar Populations
- Scott County, MS R+18
- Fredericksburg City, VA D+28
- Peach County, GA D+7
- White County, GA R+58
- Monroe County, GA R+42
- Dinwiddie County, VA R+16
- Randolph County, WV R+51
- Hocking County, OH R+51
- Tate County, MS R+35
- Currituck County, NC 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.