99153 leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 78% of adults in 99153 typically vote, above the U.S. average of about 62%. Among adults in 99153, ~24% vote Democratic, ~54% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How 99153 compares
99153 sits in a sparsely populated area with few comparable zip codes nearby.
99153 runs about 57 points more Republican than Washington as a whole. Washington leans Democratic overall, while 99153 is one of the few Republican-leaning pockets.
Why 99153 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 99153, not a ranked or complete list of what matters most.
99153 votes against the grain of Washington. Washington leans Democratic overall, while 99153 runs about 57 points more Republican.
Never-married share, developed land, and voter turnout
Places that combine a low never-married share and a rural land-use pattern tend to turn out at a higher rate, as 99153, WA does.
Why turnout in 99153 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 99153 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 63%. 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.