99363 is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 58% of adults in 99363 typically vote, near the U.S. average of about 62%. Among adults in 99363, ~13% vote Democratic, ~45% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.
How 99363 compares
Among zip codes within 15 miles, 99363 is the most Republican-leaning.
99363 runs about 75 points more Republican than Washington as a whole. Washington leans Democratic overall, while 99363 is one of the few Republican-leaning pockets.
Why 99363 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 99363, not a ranked or complete list of what matters most.
99363 votes against the grain of Washington. Washington leans Democratic overall, while 99363 runs about 75 points more Republican. Low college attainment predicts Republican voting, and 99363 sits in the bottom quarter (about 10%, below 94% of zip codes). A high family-household share predicts Republican voting, and about 82% of households in 99363 are family households, above 94% of zip codes.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; 99363, WA sits in the bottom quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 99363 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 99363 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. 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.