Sweet Grass County is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 89% of adults in Sweet Grass County typically vote, above the U.S. average of about 62%. Among adults in Sweet Grass County, ~21% vote Democratic, ~68% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How Sweet Grass County compares
Among counties within 50 miles, Sweet Grass County leans more Republican than 1 of 3 neighbors.
Sweet Grass County runs about 34 points more Republican than Montana as a whole.
Why Sweet Grass 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 Sweet Grass County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 69% of households in Sweet Grass County are family households, above 77% of counties.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; Sweet Grass County, MT sits in the top tenth nationally on this measure.
Why turnout in Sweet Grass County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Sweet Grass 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%. High high-school completion lines up with higher turnout, and about 97% of adults in Sweet Grass County have completed high school, in the top fraction of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Stillwater County, MT R+57
- Park County, MT R+14
- Wheatland County, MT R+66
- Golden Valley County, MT R+69
- Carbon County, MT R+38
- Gallatin County, MT D+6
- Yellowstone County, MT R+25
- Meagher County, MT R+58
- Musselshell County, MT R+64
- Broadwater County, MT R+54
Counties with Similar Populations
- Fisher County, TX R+67
- Norton City, VA R+39
- Echols County, GA R+66
- Cavalier County, ND R+48
- Adams County, IA R+46
- Hardin County, IL R+57
- Lyman County, SD R+5
- Knox County, MO R+66
- Ellis County, OK R+77
- Lake of the Woods County, MN R+40
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.