Big Horn County is a true toss-up. About 51% of voters here vote Democratic and 49% Republican.
About 57% of adults in Big Horn County typically vote, near the U.S. average of about 62%. Among adults in Big Horn County, ~29% vote Democratic, ~28% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How Big Horn County compares
Among counties within 50 miles, Big Horn County sits roughly in the middle of the political spectrum, with 2 neighbors leaning further in the place's direction and 0 leaning the other way.
Big Horn County runs about 21 points more Democratic than Montana as a whole. Montana leans Republican overall, while Big Horn County sits closer to the political middle.
Politics vary noticeably by city within Big Horn County. The southeast side runs the most Democratic (D+28) and the northeast side runs the most Republican (R+61), a spread of about 89 points.
Why Big Horn 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 Big Horn County, not a ranked or complete list of what matters most.
Big Horn County votes against the grain of Montana. Montana leans Republican overall, while Big Horn County runs about 21 points more Democratic.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; Big Horn County, MT sits in the bottom tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Big Horn County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Big Horn County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 47%, about 15 points below the Montana average of 62%. High food insecurity lines up with lower turnout, and about 30% of adults in Big Horn County report food insecurity, above 96% of counties. High-crime urban areas turn out at lower rates, and Big Horn County sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Treasure County, MT R+66
- Rosebud County, MT R+20
- Yellowstone County, MT R+25
- Sheridan County, WY R+47
- Big Horn County, WY R+73
- Musselshell County, MT R+64
- Carbon County, MT R+38
- Stillwater County, MT R+57
- Golden Valley County, MT R+69
- Powder River County, MT R+72
Counties with Similar Populations
- Cass County, IA R+41
- Powell County, KY R+60
- Kodiak Island Borough, AK R+16
- Mason County, IL R+46
- Lewis County, KY R+66
- Shoshone County, ID R+43
- Crenshaw County, AL R+54
- Mono County, CA D+13
- Lamb County, TX R+57
- Cass County, IL R+31
Sources and methodology
Precinct-level voting records used to fit the model come from Montana 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.