Kendall County is a true toss-up. About 51% of voters here vote Democratic and 49% Republican.
About 80% of adults in Kendall County typically vote, above the U.S. average of about 62%. Among adults in Kendall County, ~41% vote Democratic, ~39% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.
How Kendall County compares
Among counties within 50 miles, Kendall County sits roughly in the middle of the political spectrum, with 4 neighbors leaning further in the place's direction and 6 leaning the other way.
Kendall County runs about 10 points more Republican than Illinois as a whole.
Politics vary noticeably by city within Kendall County. The northeast side runs the most Democratic (D+14) and the southwest side runs the most Republican (R+30), a spread of about 43 points.
Why Kendall County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Kendall County. The lean here lands roughly where demographic data alone would predict.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Kendall County, IL sits in the top 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 Kendall County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Kendall 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 85% of households in Kendall County own their home, above 96% of counties. High high-school completion lines up with higher turnout, and about 94% of adults in Kendall County have completed high school, above 85% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Will County, IL D+6
- Kane County, IL D+13
- DuPage County, IL D+14
- Grundy County, IL R+26
- DeKalb County, IL D+3
- LaSalle County, IL R+21
- Cook County, IL D+42
- McHenry County, IL R+5
- Kankakee County, IL R+9
- Lake County, IL D+22
Counties with Similar Populations
- Wood County, OH R+11
- Pickens County, SC R+43
- Tazewell County, IL R+29
- Black Hawk County, IA D+3
- Strafford County, NH D+4
- Washington County, TN R+37
- Cache County, UT R+32
- Tangipahoa Parish, LA R+31
- Cambria County, PA R+35
- Harnett County, NC R+21
All Local Stats
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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.