Valley County leans heavily Republican by roughly 40 points: about 30% of voters vote Democratic and 70% Republican.
About 71% of adults in Valley County typically vote, above the U.S. average of about 62%. Among adults in Valley County, ~21% vote Democratic, ~50% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How Valley County compares
Valley County runs about 5 points more Republican than Idaho as a whole.
Politics vary noticeably by city within Valley County. The west side is the most Republican-leaning (R+51) and the northwest side is the least Republican-leaning (R+32), a spread of about 20 points.
Why Valley 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 Valley County, not a ranked or complete list of what matters most.
Rural areas with a high white share vote Republican. Valley County sits in the bottom quarter on density and about 91% of residents are non-Hispanic white, about 8 points above the Idaho average of 83%.
Population density and Republican lean
Places with low population density tend to lean Republican; Valley County, ID sits in the bottom quarter nationally on this measure.
Why turnout in Valley County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Valley County 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 65%, about 5 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 85% of households in Valley County own their home, above 95% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Adams County, ID R+57
- Washington County, ID R+57
- Boise County, ID R+50
- Gem County, ID R+58
- Payette County, ID R+57
- Malheur County, OR R+42
- Wallowa County, OR R+20
- Ada County, ID R+8
- Baker County, OR R+41
- Idaho County, ID R+64
Counties with Similar Populations
- Shelby County, IA R+48
- Marshall County, IL R+37
- Juab County, UT R+71
- Marion County, KS R+52
- Terry County, TX R+49
- Cherokee County, IA R+42
- Northumberland County, VA R+19
- Ward County, TX R+56
- Magoffin County, KY R+67
- Barton County, MO R+65
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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.