Summit Valley is a Republican stronghold. About 20% of voters here vote Democratic and 80% Republican.
About 82% of adults in Summit Valley typically vote, above the U.S. average of about 62%. Among adults in Summit Valley, ~16% vote Democratic, ~66% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Summit Valley compares
Among cities within 25 miles, Summit Valley leans more Republican than 11 of 13 neighbors.
Summit Valley runs about 40 points more Republican than Montana as a whole.
Politics vary noticeably by neighborhood within Summit Valley. The west side is the most Republican-leaning (R+60) and the northeast side is the least Republican-leaning (R+50), a spread of about 10 points.
Why Summit Valley leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Summit Valley, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 81% of households in Summit Valley are family households, about 15 points above the U.S. average of 67%.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Summit Valley, MT sits in the bottom tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Summit Valley looks the way it does
Turnout in Summit Valley sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Cardwell, MT R+59
- Harrison, MT R+60
- Pony, MT R+60
- Jefferson Island, MT R+58
- Whitehall, MT R+54
- Willow Creek, MT R+52
- Norris, MT R+56
- Red Bluff, MT R+51
- Three Forks, MT R+46
- Silver Star, MT R+58
Cities with Similar Populations
- Fulda, IN R+42
- Floralhill, GA R+47
- Centerville, NC R+45
- Redwine, KY R+68
- Redbird, WY R+90
- Claquato, WA R+27
- Clementson, MN R+36
- Prairie, ID R+55
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.