97403 is a Democratic stronghold. About 84% of voters here vote Democratic and 16% Republican.
About 56% of adults in 97403 typically vote, below the U.S. average of about 62%. Among adults in 97403, ~47% vote Democratic, ~9% Republican, and ~44% don't vote. The map below shows estimated turnout by block group.
How 97403 compares
Among zip codes within 15 miles, 97403 is the most Democratic-leaning.
97403 runs about 54 points more Democratic than Oregon as a whole.
Politics vary noticeably by block within 97403. The southwest side is the most Democratic-leaning (D+75) and the northeast side is the least Democratic-leaning (D+35), a spread of about 41 points.
Why 97403 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 97403, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 57% of adults in 97403 hold a bachelor's degree, about 28 points above the U.S. average of 28%. Dense areas vote Democratic, and 97403 sits in the top fifth on density (about 86%, above 86% of zip codes). A high never-married share predicts Democratic voting, and about 69% of adults in 97403 have never been married, in the top fraction of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 97403, OR sits in the top 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 97403 looks the way it does
Renters vote less often than owners. About 68% of households in 97403 rent, about 43 points above the U.S. average of 25%. 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.