Boise leans Republican by roughly 24 points: about 38% of voters vote Democratic and 62% Republican.
About 68% of adults in Boise typically vote, above the U.S. average of about 62%. Among adults in Boise, ~26% vote Democratic, ~42% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How Boise compares
Among cities within 25 miles, Boise leans more Republican than 47 of 63 neighbors.
Boise runs about 42 points more Republican than Washington as a whole. Washington leans Democratic overall, while Boise is one of the few Republican-leaning pockets.
Why Boise 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 Boise, not a ranked or complete list of what matters most.
Boise votes against the grain of Washington. Washington leans Democratic overall, while Boise runs about 42 points more Republican. A high family-household share predicts Republican voting, and about 81% of households in Boise are family households, above 92% of cities.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Boise, WA sits above the national average on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Boise looks the way it does
Turnout in Boise 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 Cities
- Enumclaw, WA R+7
- Burnett, WA R+32
- Buckley, WA R+26
- Wilkeson, WA R+36
- South Prairie, WA R+38
- Osceola, WA R+21
- Wabash, WA R+31
- Carbonado, WA R+37
- Prairie Ridge, WA R+17
- Cumberland, WA R+22
Cities with Similar Populations
- Garden City, AL R+81
- Gap Creek, TN R+67
- Celoron, NY R+10
- Moss Bluff, FL R+60
- Bon Ami, TX R+77
- Bella Villa, MO D+6
- Harrisville, NH D+13
- Rider, WV R+55
- Norge, OK R+70
- Elmwood, TN R+66
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Washington 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.