98391 leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 88% of adults in 98391 typically vote, above the U.S. average of about 62%. Among adults in 98391, ~40% vote Democratic, ~47% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How 98391 compares
Among zip codes within 15 miles, 98391 leans more Republican than 34 of 40 neighbors.
98391 runs about 27 points more Republican than Washington as a whole. Washington leans Democratic overall, while 98391 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 98391. The south side runs the most Democratic (D+5) and the northeast side runs the most Republican (R+18), a spread of about 23 points.
Why 98391 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 98391, not a ranked or complete list of what matters most.
98391 votes Republican even though it is densely developed (about 69%, well above the Washington average of 41%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 78% of households in 98391 are family households, above 89% of zip codes. 98391 runs against the grain of Washington, a Republican-leaning pocket in a Democratic-leaning state.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as 98391, WA does.
Why turnout in 98391 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 98391 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 68%, about 8 points above the U.S. average of 60%. 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.