Tazewell County leans Republican by roughly 28 points: about 36% of voters vote Democratic and 64% Republican.
About 80% of adults in Tazewell County typically vote, above the U.S. average of about 62%. Among adults in Tazewell County, ~29% vote Democratic, ~51% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.
How Tazewell County compares
Among counties within 50 miles, Tazewell County leans more Republican than 4 of 12 neighbors.
Tazewell County runs about 40 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Tazewell County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Tazewell County. The southeast side is the most Republican-leaning (R+49) and the west side is the least Republican-leaning (R+23), a spread of about 26 points.
Why Tazewell 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 Tazewell County, not a ranked or complete list of what matters most.
Tazewell County votes Republican even though it is densely developed (about 49%, well above the Illinois average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here. Tazewell County runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as Tazewell County, IL does.
Why turnout in Tazewell County looks the way it does
Areas with high high-school completion turn out at higher rates. About 94% of adults in Tazewell County have completed high school, above 86% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Peoria County, IL D+14
- Woodford County, IL R+40
- Mason County, IL R+46
- McLean County, IL D+5
- Fulton County, IL R+31
- Marshall County, IL R+37
- Logan County, IL R+41
- Stark County, IL R+47
- De Witt County, IL R+43
- Menard County, IL R+41
Counties with Similar Populations
- Pickens County, SC R+43
- Black Hawk County, IA D+3
- Strafford County, NH D+4
- Kendall County, IL Even
- Wood County, OH R+11
- Madison County, IN R+25
- Rapides Parish, LA R+24
- Washington County, RI D+11
- Sumter County, FL R+31
- Washington County, TN R+37
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.