Ketchum, ID Political Map | Democrat & Republican Areas in Ketchum

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

Ketchum leans Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.

 

About 85% of adults in Ketchum typically vote, above the U.S. average of about 62%. Among adults in Ketchum, ~55% vote Democratic, ~30% Republican, and ~15% don't vote. The map below shows estimated turnout by block group.

How Ketchum compares

Among cities within 25 miles, Ketchum leans more Democratic than 5 of 7 neighbors.

Ketchum runs about 66 points more Democratic than Idaho as a whole. Idaho leans Republican overall, while Ketchum is one of the few Democratic-leaning pockets.

Politics vary noticeably by neighborhood within Ketchum. The west side is the most Democratic-leaning (D+35) and the northeast side is the least Democratic-leaning (D+21), a spread of about 15 points.

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

Areas with high college attainment vote Democratic. About 62% of adults in Ketchum hold a bachelor's degree, about 33 points above the U.S. average of 28%. Dense areas vote Democratic, and Ketchum sits in the top fifth on density (about 37%, above 83% of cities). Ketchum runs against the grain of Idaho, a Democratic-leaning pocket in a Republican-leaning state.

Preventive-care access and voter turnout

Places with strong routine preventive-care access tend to turn out at a higher rate; Ketchum, ID sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.

Why turnout in Ketchum looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Ketchum is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Ketchum have completed high school, above 89% of cities. 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.