99005 leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 96% of adults in 99005 typically vote, above the U.S. average of about 62%. Among adults in 99005, ~33% vote Democratic, ~63% Republican, and ~4% don't vote. The map below shows estimated turnout by block group.
How 99005 compares
Among zip codes within 15 miles, 99005 leans more Republican than 18 of 24 neighbors.
99005 runs about 50 points more Republican than Washington as a whole. Washington leans Democratic overall, while 99005 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 99005. The northwest side is the most Republican-leaning (R+39) and the southwest side is the least Republican-leaning (R+24), a spread of about 15 points.
Why 99005 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 99005, not a ranked or complete list of what matters most.
99005 votes against the grain of Washington. Washington leans Democratic overall, while 99005 runs about 50 points more Republican. A high family-household share predicts Republican voting, and about 87% of households in 99005 are family households, above 98% of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 99005, WA sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 99005 looks the way it does
Homeowners vote more often than renters. About 95% of households in 99005 own their home, about 22 points above the Washington average of 73%. High high-school completion lines up with higher turnout, and about 98% of adults in 99005 have completed high school, above 94% 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.