99009 leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 86% of adults in 99009 typically vote, above the U.S. average of about 62%. Among adults in 99009, ~24% vote Democratic, ~62% Republican, and ~14% don't vote. The map below shows estimated turnout by block group.
How 99009 compares
Among zip codes within 15 miles, 99009 leans more Republican than 4 of 6 neighbors.
99009 runs about 62 points more Republican than Washington as a whole. Washington leans Democratic overall, while 99009 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 99009. The west side is the most Republican-leaning (R+46) and the northeast side is the least Republican-leaning (R+33), a spread of about 13 points.
Why 99009 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 99009, not a ranked or complete list of what matters most.
99009 votes against the grain of Washington. Washington leans Democratic overall, while 99009 runs about 62 points more Republican. A high family-household share predicts Republican voting, and about 80% of households in 99009 are family households, above 92% of zip codes.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; 99009, WA sits in the top tenth nationally on this measure.
Why turnout in 99009 looks the way it does
Homeowners vote more often than renters. About 92% of households in 99009 own their home, about 19 points above the Washington average of 73%. High high-school completion lines up with higher turnout, and about 96% of adults in 99009 have completed high school, above 81% 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.