Grangeville is a Republican stronghold. About 19% of voters here vote Democratic and 81% Republican.
About 75% of adults in Grangeville typically vote, above the U.S. average of about 62%. Among adults in Grangeville, ~14% vote Democratic, ~61% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How Grangeville compares
Among cities within 25 miles, Grangeville leans more Republican than 3 of 13 neighbors.
Grangeville runs about 25 points more Republican than Idaho as a whole.
Politics vary noticeably by neighborhood within Grangeville. The northwest side is the most Republican-leaning (R+75) and the east side is the least Republican-leaning (R+51), a spread of about 24 points.
Why Grangeville 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 Grangeville, not a ranked or complete list of what matters most.
Grangeville votes Republican even though it is densely developed (about 36%, well above the Idaho average of 18%). Here an older population outweighs the Democratic lean that density usually predicts.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Grangeville, ID sits in the top quarter nationally on this measure.
Why turnout in Grangeville looks the way it does
Turnout in Grangeville 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
- Golden, ID R+72
- Mount Idaho, ID R+70
- Stites, ID R+69
- Greencreek, ID R+71
- White Bird, ID R+69
- Cottonwood, ID R+63
- Kooskia, ID R+62
- Slate Creek, ID R+68
- Syringa, ID R+44
- Ferdinand, ID R+71
Cities with Similar Populations
- Staatsburg, NY D+3
- Country Lake Estates, NJ D+2
- Trent Woods, NC R+25
- Emmetsburg, IA R+38
- Rogers City, MI R+28
- Lake George, NY R+2
- Irrigon, OR R+41
- Cross, SC D+12
- Proctor, MN D+5
- El Granada, CA D+39
Sources and methodology
Precinct-level voting records used to fit the model come from Idaho 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.