Mercer Heights leans heavily Democratic by roughly 48 points: about 74% of voters vote Democratic and 26% Republican.
About 87% of adults in Mercer Heights typically vote, above the U.S. average of about 62%. Among adults in Mercer Heights, ~64% vote Democratic, ~23% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How Mercer Heights compares
Among neighborhoods within 5 miles, Mercer Heights leans more Democratic than 8 of 21 neighbors.
Mercer Heights runs about 30 points more Democratic than Washington as a whole.
Politics vary noticeably by block within Mercer Heights. The west side is the most Democratic-leaning (D+54) and the northeast side is the least Democratic-leaning (D+42), a spread of about 11 points.
Why Mercer Heights leans the way it does
This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for Mercer Heights, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 83% of adults in Mercer Heights hold a bachelor's degree, about 54 points above the U.S. average of 28%.
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 Mercer Heights, Mercer Island, WA does.
Why turnout in Mercer Heights looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Mercer Heights 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 79%, about 19 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 88% of households in Mercer Heights own their home, compared to around 56% in nearby neighborhoods. High high-school completion lines up with higher turnout, and about 98% of adults in Mercer Heights have completed high school, above 81% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- McGilvra, Mercer Island, WA D+52
- Seward Park, Seattle, WA D+74
- Meydenbauer, Bellevue, WA D+45
- Mt. Baker, Seattle, WA D+73
- Columbia City, Seattle, WA D+71
- Brighton, Seattle, WA D+64
- Factoria, Bellevue, WA D+40
- Woodbridge, Bellevue, WA D+42
- Downtown Seattle, Seattle, WA D+53
- Beacon Hill, Seattle, WA D+60
Neighborhoods with Similar Populations
- West Eugene, Eugene, OR D+53
- Clapp Park, Lubbock, TX D+6
- Laurel, Oakland, CA D+70
- Oakhurst, Charlotte, NC D+35
- Palmer Heights, Easton, PA R+6
- Cobbs Hill, Rochester, NY D+59
- Brookwood, Mobile, AL D+35
- Tri-Court, Lincoln, NE D+5
- Roosevelt Gardens Area, Norfolk, VA R+8
- Highlands-Kirkland, Kirkland, WA D+45
All Local Stats
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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.