Sudden Valley, WA Political Map | Democrat & Republican Areas in Sudden Valley

By the BestNeighborhood data science team. Last updated May 2026.

Sudden Valley leans heavily Democratic by roughly 44 points: about 72% of voters vote Democratic and 28% Republican.

 

About 97% of adults in Sudden Valley typically vote, above the U.S. average of about 62%. Among adults in Sudden Valley, ~70% vote Democratic, ~27% Republican, and ~3% don't vote. The map below shows estimated turnout by block group.

How Sudden Valley compares

Among cities within 25 miles, Sudden Valley leans more Democratic than 41 of 48 neighbors.

Sudden Valley runs about 25 points more Democratic than Washington as a whole.

Politics vary noticeably by neighborhood within Sudden Valley. The northwest side is the most Democratic-leaning (D+55) and the southeast side is the least Democratic-leaning (D+35), a spread of about 20 points.

Why Sudden Valley leans the way it does

This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Sudden Valley, not a ranked or complete list of what matters most.

Areas with high college attainment vote Democratic. About 49% of adults in Sudden Valley hold a bachelor's degree, about 20 points above the U.S. average of 28%. Dense areas vote Democratic, and Sudden Valley sits in the top fifth on density (about 35%, above 82% of cities).

Cancer-screening access and voter turnout

Places with high colon-cancer-screening access tend to turn out at a higher rate; Sudden Valley, WA sits in the top tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.

Why turnout in Sudden Valley looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Sudden Valley 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 75%, about 15 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 92% of households in Sudden Valley own their home, about 17 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 97% of adults in Sudden Valley have completed high school, above 89% of cities. Learn more about the findings and methodology on the political spectrum map.

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.