Johnson County, KS Political Map | Democrat & Republican Areas in Johnson County

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

Johnson County leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.

 

About 77% of adults in Johnson County typically vote, above the U.S. average of about 62%. Among adults in Johnson County, ~42% vote Democratic, ~35% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.

How Johnson County compares

Among counties within 50 miles, Johnson County leans more Democratic than 12 of 15 neighbors.

Johnson County runs about 26 points more Democratic than Kansas as a whole. Kansas leans Republican overall, while Johnson County is one of the few Democratic-leaning pockets.

Politics vary noticeably by city within Johnson County. The northeast side runs the most Democratic (D+32) and the southwest side runs the most Republican (R+8), a spread of about 39 points.

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

Areas with high college attainment vote Democratic. About 57% of adults in Johnson County hold a bachelor's degree, about 29 points above the U.S. average of 28%. Dense areas vote Democratic, and Johnson County sits in the top fifth on density (about 87%, above 98% of counties). Johnson County runs against the grain of Kansas, a Democratic-leaning pocket in a Republican-leaning state.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; Johnson County, KS sits in the top tenth 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 Johnson County looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Johnson 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 73%, about 13 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Johnson County have completed high school, above 98% 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 Kansas Secretary of State, 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.