99001 leans slightly Republican by roughly 14 points: about 43% of voters vote Democratic and 57% Republican.
About 62% of adults in 99001 typically vote, near the U.S. average of about 62%. Among adults in 99001, ~27% vote Democratic, ~35% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How 99001 compares
Among zip codes within 15 miles, 99001 leans more Republican than 17 of 22 neighbors.
99001 runs about 33 points more Republican than Washington as a whole. Washington leans Democratic overall, while 99001 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 99001. The southwest side is the most Republican-leaning (R+32) and the northeast side is the least Republican-leaning (R+9), a spread of about 23 points.
Why 99001 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 99001, not a ranked or complete list of what matters most.
99001 votes against the grain of Washington. Washington leans Democratic overall, while 99001 runs about 33 points more Republican.
Homeownership and voter turnout
Places with renter-heavy households tend to turn out at a lower rate; 99001, WA sits in the bottom tenth nationally on this measure.
Why turnout in 99001 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 99001 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 77% of households in 99001 rent, compared to around 53% in nearby 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.