98125 is a Democratic stronghold. About 83% of voters here vote Democratic and 17% Republican.
About 67% of adults in 98125 typically vote, near the U.S. average of about 62%. Among adults in 98125, ~56% vote Democratic, ~11% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How 98125 compares
Among zip codes within 15 miles, 98125 leans more Democratic than 44 of 60 neighbors.
98125 runs about 47 points more Democratic than Washington as a whole.
Politics vary noticeably by block within 98125. The southeast side is the most Democratic-leaning (D+75) and the north side is the least Democratic-leaning (D+57), a spread of about 18 points.
Why 98125 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 98125, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 97% of residents in 98125 live in densely developed areas, about 61 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 98125 sits in the top quarter (about 60%, above 94% of zip codes). A high never-married share predicts Democratic voting, and about 39% of adults in 98125 have never been married, above 86% of zip codes.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 98125, WA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 98125 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 98125 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 70%, about 10 points above the U.S. average of 60%. 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.