Marion County is a Republican stronghold. About 24% of voters here vote Democratic and 76% Republican.
About 74% of adults in Marion County typically vote, above the U.S. average of about 62%. Among adults in Marion County, ~18% vote Democratic, ~56% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Marion County compares
Among counties within 50 miles, Marion County leans more Republican than 8 of 9 neighbors.
Marion County runs about 36 points more Republican than Kansas as a whole.
Politics vary noticeably by city within Marion County. The northeast side is the most Republican-leaning (R+67) and the west side is the least Republican-leaning (R+46), a spread of about 22 points.
Why Marion County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Marion County. The lean here lands roughly where demographic data alone would predict.
Population density and Republican lean
Places with low population density tend to lean Republican; Marion County, KS sits below the national average on this measure.
Why turnout in Marion County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Marion 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 66%, about 6 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 82% of households in Marion County own their home, above 86% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Harvey County, KS R+33
- McPherson County, KS R+44
- Chase County, KS R+49
- Dickinson County, KS R+51
- Morris County, KS R+52
- Butler County, KS R+41
- Saline County, KS R+26
- Sedgwick County, KS R+7
- Reno County, KS R+35
- Lyon County, KS R+14
Counties with Similar Populations
- Terry County, TX R+49
- Northumberland County, VA R+19
- Juab County, UT R+71
- Custer County, MT R+43
- Linn County, MO R+55
- Valley County, ID R+41
- Shelby County, IA R+48
- Marshall County, IL R+37
- Owyhee County, ID R+63
- Lyon County, IA R+65
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.