99216 leans slightly Republican by roughly 12 points: about 44% of voters vote Democratic and 56% Republican.
About 72% of adults in 99216 typically vote, above the U.S. average of about 62%. Among adults in 99216, ~32% vote Democratic, ~40% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How 99216 compares
Among zip codes within 15 miles, 99216 leans more Republican than 16 of 28 neighbors.
99216 runs about 31 points more Republican than Washington as a whole. Washington leans Democratic overall, while 99216 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 99216. The northeast side is the most split-leaning (R+28) and the west side is the least split-leaning (R+2), a spread of about 25 points.
Why 99216 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 99216, not a ranked or complete list of what matters most.
99216 votes Republican even though it is densely developed (about 90%, far above the Washington average of 41%). State and regional patterns outweigh the Democratic lean that density usually predicts here. 99216 runs against the grain of Washington, a Republican-leaning pocket in a Democratic-leaning state.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 99216, WA 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 99216 looks the way it does
Turnout in 99216 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.