Boise is a Democratic stronghold. About 91% of voters here vote Democratic and 9% Republican.
About 68% of adults in Boise typically vote, above the U.S. average of about 62%. Among adults in Boise, ~62% vote Democratic, ~6% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How Boise compares
Among neighborhoods within 5 miles, Boise leans more Democratic than 27 of 35 neighbors.
Boise runs about 67 points more Democratic than Oregon as a whole.
Why Boise leans the way it does
This analysis examined 14,881 data points per neighborhood 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.
Dense areas vote Democratic. More than 99% of residents in Boise live in densely developed areas, about 64 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Boise sits in the top quarter (about 65%, above 85% of neighborhoods). A high never-married share predicts Democratic voting, and about 57% of adults in Boise have never been married, above 91% of neighborhoods.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Boise, Portland, OR sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
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 Neighborhoods
- Overlook, Portland, OR D+83
- King, Portland, OR D+82
- Eliot, Portland, OR D+79
- Alberta, Portland, OR D+84
- Woodlawn, Portland, OR D+78
- Arbor Lodge, Portland, OR D+75
- Irvington, Portland, OR D+85
- Pearl District, Portland, OR D+63
- Slabtown, Portland, OR D+78
- Concordia, Portland, OR D+79
Neighborhoods with Similar Populations
- Glen Iris, Birmingham, AL D+56
- Bon Air, Louisville, KY D+31
- Chicot West, Little Rock, AR D+46
- West Highland, Denver, CO D+65
- Gentilly Terrace, New Orleans, LA D+75
- Walker's Point, Milwaukee, WI D+49
- Georgian Acres, Austin, TX D+48
- The Pueblo, Las Vegas, NV D+13
- East Watertown, Watertown Town, MA D+62
- Southwest Corridor, Billings, MT R+19
Sources and methodology
Precinct-level voting records used to fit the model come from Oregon Secretary of State, Elections Division, 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.