Cass County leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican.
About 70% of adults in Cass County typically vote, above the U.S. average of about 62%. Among adults in Cass County, ~33% vote Democratic, ~37% Republican, and ~30% 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 1 of 6 neighbors.
Cass County runs about 31 points more Democratic than North Dakota as a whole.
Politics vary noticeably by city within Cass County. The east side runs the most Democratic (D+10) and the southwest side runs the most Republican (R+46), a spread of about 55 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.
Cass County votes Republican even though it is densely developed (about 87%, far above the North Dakota average of 12%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Cass County, ND 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 Cass County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Cass 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 68%, about 8 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Cass County have completed high school, above 96% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Clay County, MN R+3
- Norman County, MN R+27
- Wilkin County, MN R+39
- Richland County, ND R+38
- Ransom County, ND R+46
- Traill County, ND R+37
- Becker County, MN R+33
- Barnes County, ND R+36
- Mahnomen County, MN R+16
- Sargent County, ND R+50
Counties with Similar Populations
- DeSoto County, MS R+15
- Boone County, MO D+14
- Newport News City, VA D+38
- Tippecanoe County, IN D+9
- Medina County, OH R+25
- Iredell County, NC R+23
- Charlotte County, FL R+33
- Shasta County, CA R+30
- Beaufort County, SC R+9
- Ulster County, NY D+16
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Sources and methodology
Precinct-level voting records used to fit the model come from North Dakota 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.