Atchison County leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 65% of adults in Atchison County typically vote, near the U.S. average of about 62%. Among adults in Atchison County, ~21% vote Democratic, ~43% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How Atchison County compares
Among counties within 50 miles, Atchison County leans more Republican than 8 of 18 neighbors.
Atchison County runs about 18 points more Republican than Kansas as a whole.
Politics vary noticeably by city within Atchison County. The northwest side is the most Republican-leaning (R+63) and the northeast side is the least Republican-leaning (R+18), a spread of about 45 points.
Why Atchison County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Atchison County. The lean here lands roughly where demographic data alone would predict.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; Atchison County, KS sits in the top tenth nationally on this measure.
Why turnout in Atchison County looks the way it does
Turnout in Atchison 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
- Doniphan County, KS R+58
- Buchanan County, MO R+23
- Leavenworth County, KS R+20
- Brown County, KS R+42
- Jefferson County, KS R+50
- Andrew County, MO R+50
- Jackson County, KS R+45
- Platte County, MO R+5
- Holt County, MO R+61
- Wyandotte County, KS D+26
Counties with Similar Populations
- Jasper County, MS D+2
- Fayette County, AL R+68
- Alamosa County, CO R+3
- Clay County, IA R+34
- Hill County, MT R+23
- Brooks County, GA R+23
- Potter County, PA R+58
- Lawrence County, KY R+67
- New Madrid County, MO R+46
- Dade County, GA R+64
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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.