99023 leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 91% of adults in 99023 typically vote, above the U.S. average of about 62%. Among adults in 99023, ~30% vote Democratic, ~61% Republican, and ~9% don't vote. The map below shows estimated turnout by block group.
How 99023 compares
Among zip codes within 15 miles, 99023 leans more Republican than 18 of 24 neighbors.
99023 runs about 53 points more Republican than Washington as a whole. Washington leans Democratic overall, while 99023 is one of the few Republican-leaning pockets.
Why 99023 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 99023, not a ranked or complete list of what matters most.
99023 votes against the grain of Washington. Washington leans Democratic overall, while 99023 runs about 53 points more Republican. A high family-household share predicts Republican voting, and about 84% of households in 99023 are family households, above 97% of zip codes.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; 99023, WA sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 99023 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 99023 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 73%, about 13 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 96% of households in 99023 own their home, compared to around 74% 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.