Lost River, ID Political Map | Democrat & Republican Areas in Lost River

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

Lost River is a Republican stronghold. About 18% of voters here vote Democratic and 82% Republican.

 

About 49% of adults in Lost River typically vote, below the U.S. average of about 62%. Among adults in Lost River, ~9% vote Democratic, ~40% Republican, and ~51% don't vote. The map below shows estimated turnout by block group.

How Lost River compares

Among cities within 25 miles, Lost River leans more Republican than 2 of 7 neighbors.

Lost River runs about 28 points more Republican than Idaho as a whole.

Politics vary noticeably by neighborhood within Lost River. The south side is the most Republican-leaning (R+71) and the southwest side is the least Republican-leaning (R+58), a spread of about 13 points.

Why Lost River 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 Lost River, not a ranked or complete list of what matters most.

Rural areas vote Republican. About 1% of residents in Lost River live in densely developed areas, about 17 points below the Idaho average of 18%.

Population density and Republican lean

Places with low population density tend to lean Republican; Lost River, ID sits in the bottom tenth nationally on this measure.

Why turnout in Lost River looks the way it does

Turnout in Lost River 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.

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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.