Cass County leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 82% of adults in Cass County typically vote, above the U.S. average of about 62%. Among adults in Cass County, ~28% vote Democratic, ~54% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Cass County compares
Among counties within 50 miles, Cass County leans more Republican than 7 of 15 neighbors.
Cass County runs about 14 points more Republican than Missouri as a whole.
Politics vary noticeably by city within Cass County. The southwest side is the most Republican-leaning (R+55) and the northwest side is the least Republican-leaning (R+17), a spread of about 37 points.
Why Cass 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 Cass County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 72% of households in Cass County are family households, about 6 points above the U.S. average of 67%.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Cass County, MO sits above the national average 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 Cass County looks the way it does
Areas with high high-school completion turn out at higher rates. About 94% of adults in Cass County have completed high school, above 86% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Jackson County, MO D+24
- Johnson County, KS D+9
- Miami County, KS R+39
- Wyandotte County, KS D+26
- Bates County, MO R+60
- Clay County, MO R+7
- Johnson County, MO R+35
- Lafayette County, MO R+51
- Platte County, MO R+5
- Linn County, KS R+61
Counties with Similar Populations
- Rockwall County, TX R+35
- Yamhill County, OR R+5
- Kankakee County, IL R+9
- Houston County, AL R+30
- St. Lawrence County, NY R+18
- Matanuska-Susitna Borough, AK R+33
- Bradley County, TN R+48
- Carver County, MN R+8
- Miami County, OH R+42
- Bartow County, GA R+46
Sources and methodology
Precinct-level voting records used to fit the model come from Missouri 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.