Idaho County is a Republican stronghold. About 18% of voters here vote Democratic and 82% Republican.
About 66% of adults in Idaho County typically vote, near the U.S. average of about 62%. Among adults in Idaho County, ~12% vote Democratic, ~54% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.
How Idaho County compares
Among counties within 50 miles, Idaho County is the most Republican-leaning.
Idaho County runs about 27 points more Republican than Idaho as a whole.
Politics vary noticeably by city within Idaho County. The northwest side is the most Republican-leaning (R+68) and the northeast side is the least Republican-leaning (R+30), a spread of about 38 points.
Why Idaho 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 Idaho County, not a ranked or complete list of what matters most.
Rural areas with a high white share vote Republican. Idaho County sits in the bottom quarter on density and about 90% of residents are non-Hispanic white, about 8 points above the Idaho average of 83%.
Never-married share, developed land, and voter turnout
Places that combine a low never-married share and a rural land-use pattern tend to turn out at a higher rate, as Idaho County, ID does.
Why turnout in Idaho County looks the way it does
Homeowners vote more often than renters. About 82% of households in Idaho County own their home, about 7 points above the U.S. average of 75%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Lewis County, ID R+60
- Clearwater County, ID R+64
- Nez Perce County, ID R+35
- Asotin County, WA R+29
- Latah County, ID R+4
- Wallowa County, OR R+20
- Whitman County, WA D+16
- Garfield County, WA R+58
- Adams County, ID R+57
- Valley County, ID R+41
Counties with Similar Populations
- Madison County, IA R+41
- Lee County, SC D+20
- Richland County, ND R+38
- Burnett County, WI R+32
- La Paz County, AZ R+28
- Crawford County, IA R+37
- Madison County, AR R+61
- Phillips County, AR D+20
- Socorro County, NM Even
- Fountain County, IN R+58
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.