97731 leans heavily Republican by roughly 40 points: about 30% of voters vote Democratic and 70% Republican.
About 65% of adults in 97731 typically vote, near the U.S. average of about 62%. Among adults in 97731, ~20% vote Democratic, ~45% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How 97731 compares
97731 runs about 55 points more Republican than Oregon as a whole. Oregon leans Democratic overall, while 97731 is one of the few Republican-leaning pockets.
Why 97731 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 97731, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 5% of residents in 97731 live in densely developed areas, about 26 points below the Oregon average of 31%. 97731 runs against the grain of Oregon, a Republican-leaning pocket in a Democratic-leaning state.
Population density, never-married share, and Republican lean
Places that combine low population density and a never-married-heavy adult population tend to lean Republican, as 97731, OR does.
Why turnout in 97731 looks the way it does
Homeowners vote more often than renters. About 89% of households in 97731 own their home, about 16 points above the Oregon average of 74%. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.