Montpelier is a Republican stronghold. About 16% of voters here vote Democratic and 84% Republican.
About 67% of adults in Montpelier typically vote, near the U.S. average of about 62%. Among adults in Montpelier, ~11% vote Democratic, ~56% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How Montpelier compares
Among cities within 25 miles, Montpelier is the least Republican-leaning.
Montpelier runs about 33 points more Republican than Idaho as a whole.
Politics vary noticeably by neighborhood within Montpelier. The southeast side is the most Republican-leaning (R+77) and the south side is the least Republican-leaning (R+64), a spread of about 12 points.
Why Montpelier 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 Montpelier, not a ranked or complete list of what matters most.
Montpelier votes Republican even though it is densely developed (about 24%, modestly above the Idaho average of 18%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Montpelier, ID sits in the top quarter nationally on this measure.
Why turnout in Montpelier looks the way it does
Turnout in Montpelier 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
- Bern, ID R+74
- Ovid, ID R+74
- Paris, ID R+74
- Sharon, ID R+74
- Bloomington, ID R+71
- Georgetown, ID R+74
- Geneva, ID R+73
Cities with Similar Populations
- Pequot Lakes, MN R+33
- Wedowee, AL R+68
- Otto, NC R+43
- Norton, KS R+65
- Fontana-on-Geneva Lake, WI R+2
- Kingsbury, TX R+52
- Lowes Island, VA D+20
- Oak Ridge North, TX R+37
- Cornwall On Hudson, NY D+7
- Crouse, NC R+61
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.