99110 is a Republican stronghold. About 24% of voters here vote Democratic and 76% Republican.
About 85% of adults in 99110 typically vote, above the U.S. average of about 62%. Among adults in 99110, ~20% vote Democratic, ~65% Republican, and ~15% don't vote. The map below shows estimated turnout by block group.
How 99110 compares
Among zip codes within 15 miles, 99110 is the most Republican-leaning.
99110 runs about 69 points more Republican than Washington as a whole. Washington leans Democratic overall, while 99110 is one of the few Republican-leaning pockets.
Why 99110 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 99110, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 86% of residents in 99110 drive to work alone, about 12 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 84% of households in 99110 are family households, above 96% of zip codes. 99110 runs against the grain of Washington, a Republican-leaning pocket in a Democratic-leaning state.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; 99110, 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 99110 looks the way it does
Turnout in 99110 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.