Idaho Political Map | Democrat & Republican Areas in Idaho

By the BestNeighborhood data science team. Last updated May 2026.

Idaho leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.

 

About 72% of adults in Idaho typically vote, above the U.S. average of about 62%. Among adults in Idaho, ~24% vote Democratic, ~48% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.

How Idaho compares

Among states within 500 miles, Idaho leans more Republican than 5 of 6 neighbors.

Politics vary noticeably by county within Idaho. The southwest side is the most Republican-leaning (R+71) and the west side is the least Republican-leaning (R+36), a spread of about 35 points.

Why Idaho leans the way it does

This analysis examined 14,881 data points per state to find what predicts political lean and turnout. The items below are a few correlations that stood out for Idaho, not a ranked or complete list of what matters most.

Areas with a high white share and below-average college attainment vote Republican. In Idaho, about 79% of residents are non-Hispanic white, about 6 points above the U.S. average of 72%; about 31% of adults hold a bachelor's degree, below 70% of states. A high family-household share predicts Republican voting, and about 69% of households in Idaho are family households, above 90% of states.

Never-married share and voter turnout

Places with a low never-married share tend to turn out at a higher rate; Idaho sits in the bottom tenth nationally on this measure.

Why turnout in Idaho looks the way it does

Homeowners vote more often than renters. About 73% of households in Idaho own their home, above 84% of states. Learn more about the findings and methodology on the political spectrum map.

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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.