Lemhi County is a Republican stronghold. About 19% of voters here vote Democratic and 81% Republican.
About 68% of adults in Lemhi County typically vote, above the U.S. average of about 62%. Among adults in Lemhi County, ~13% vote Democratic, ~55% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How Lemhi County compares
Lemhi County runs about 25 points more Republican than Idaho as a whole.
Politics vary noticeably by city within Lemhi County. The southeast side is the most Republican-leaning (R+74) and the northwest side is the least Republican-leaning (R+55), a spread of about 19 points.
Why Lemhi 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 Lemhi County, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 6% of residents in Lemhi County live in densely developed areas, about 12 points below the Idaho average of 18%.
Population density and Republican lean
Places with low population density tend to lean Republican; Lemhi County, ID sits in the bottom quarter nationally on this measure.
Why turnout in Lemhi County looks the way it does
Turnout in Lemhi County 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 Counties
- Beaverhead County, MT R+42
- Custer County, ID R+52
- Deer Lodge County, MT R+18
- Ravalli County, MT R+43
- Silver Bow County, MT Even
- Granite County, MT R+38
- Madison County, MT R+46
- Clark County, ID R+65
- Butte County, ID R+75
- Powell County, MT R+48
Counties with Similar Populations
- Liberty County, FL R+45
- Hamilton County, IL R+62
- Traill County, ND R+37
- Thomas County, KS R+67
- Twiggs County, GA R+22
- Graham County, NC R+62
- San Augustine County, TX R+47
- Allendale County, SC D+37
- Schoolcraft County, MI R+28
- Clay County, WV R+63
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.