Piatt County, IL Political Map | Democrat & Republican Areas in Piatt County

By the BestNeighborhood data science team. Last updated May 2026.

Piatt County leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.

 

About 89% of adults in Piatt County typically vote, above the U.S. average of about 62%. Among adults in Piatt County, ~29% vote Democratic, ~60% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.

How Piatt County compares

Among counties within 50 miles, Piatt County leans more Republican than 5 of 12 neighbors.

Piatt County runs about 46 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Piatt County is one of the few Republican-leaning pockets.

Politics vary noticeably by city within Piatt County. The southeast side is the most Republican-leaning (R+51) and the east side is the least Republican-leaning (R+33), a spread of about 18 points.

Why Piatt 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 Piatt County, not a ranked or complete list of what matters most.

Car-dependent areas vote Republican. About 84% of residents in Piatt County drive to work alone, about 10 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 70% of households in Piatt County are family households, above 78% of counties. Piatt County runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.

Preventive-care access and voter turnout

Places with strong routine preventive-care access tend to turn out at a higher rate; Piatt County, IL sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.

Why turnout in Piatt County looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Piatt County 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 67%, about 7 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 86% of households in Piatt County own their home, above 97% of counties. High high-school completion lines up with higher turnout, and about 96% of adults in Piatt County have completed high school, above 97% of counties. Learn more about the findings and methodology on the political spectrum map.

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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.