Boundary County is a Republican stronghold. About 18% of voters here vote Democratic and 82% Republican.
About 74% of adults in Boundary County typically vote, above the U.S. average of about 62%. Among adults in Boundary County, ~13% vote Democratic, ~61% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Boundary County compares
Boundary County sits in a sparsely populated area with few comparable counties nearby.
Boundary County runs about 27 points more Republican than Idaho as a whole.
Why Boundary County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Boundary County, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 8% of residents in Boundary County live in densely developed areas, about 10 points below the Idaho average of 18%. A high family-household share predicts Republican voting, and about 71% of households in Boundary County are family households, above 83% of counties.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Boundary County, ID sits in the bottom quarter 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 Boundary County looks the way it does
Turnout in Boundary County 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 Counties
- Bonner County, ID R+44
- Lincoln County, MT R+50
- Pend Oreille County, WA R+38
- Kootenai County, ID R+46
- Stevens County, WA R+37
- Shoshone County, ID R+43
- Spokane County, WA R+3
- Sanders County, MT R+54
- Flathead County, MT R+32
- Benewah County, ID R+60
Counties with Similar Populations
- Koochiching County, MN R+26
- Fulton County, AR R+64
- Skamania County, WA R+13
- Macon County, GA D+22
- Jefferson County, MT R+38
- Washington County, KY R+58
- Little River County, AR R+45
- Lake County, MI R+30
- Lawrence County, MS R+30
- Chickasaw County, IA R+40
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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.