99357 is a Republican stronghold. About 21% of voters here vote Democratic and 79% Republican.
About 32% of adults in 99357 typically vote, below the U.S. average of about 62%. Among adults in 99357, ~7% vote Democratic, ~26% Republican, and ~67% don't vote. The map below shows estimated turnout by block group.
How 99357 compares
99357 runs about 76 points more Republican than Washington as a whole. Washington leans Democratic overall, while 99357 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 99357. The north side is the most Republican-leaning (R+63) and the southwest side is the least Republican-leaning (R+33), a spread of about 31 points.
Why 99357 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 99357, not a ranked or complete list of what matters most.
99357 votes against the grain of Washington. Washington leans Democratic overall, while 99357 runs about 76 points more Republican. Low college attainment predicts Republican voting, and 99357 sits in the bottom quarter (about 15%, below 83% of zip codes). A high family-household share predicts Republican voting, and about 85% of households in 99357 are family households, above 98% of zip codes.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; 99357, WA sits in the bottom quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 99357 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 99357 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 42%, about 23 points below the Washington average of 65%. Renters vote less often than owners, and about 43% of households in 99357 rent, about 18 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and about 57% of adults in 99357 have completed high school, in the bottom fraction of zip codes. 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 Washington 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.