Seaside leans Democratic by roughly 16 points: about 58% of voters vote Democratic and 42% Republican.
About 74% of adults in Seaside typically vote, above the U.S. average of about 62%. Among adults in Seaside, ~43% vote Democratic, ~31% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Seaside compares
Among cities within 25 miles, Seaside leans more Democratic than 21 of 28 neighbors.
Politically, Seaside sits close to the rest of Oregon.
Politics vary noticeably by neighborhood within Seaside. The southwest side is the most Democratic-leaning (D+29) and the southeast side is the least Democratic-leaning (D+2), a spread of about 27 points.
Why Seaside 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 Seaside, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 47% of residents in Seaside live in densely developed areas, about 11 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 37% of adults in Seaside have never been married, above 91% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Seaside, OR sits in the top quarter nationally on this measure.
Why turnout in Seaside looks the way it does
Turnout in Seaside sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Gearhart, OR D+19
- West, OR Even
- Melville, OR R+24
- Cannon Beach, OR D+25
- Tolovana Park, OR D+29
- Miles Crossing, OR R+31
- Olney, OR R+20
- Warrenton, OR R+7
- Jeffers Garden, OR R+23
- Arch Cape, OR D+18
Cities with Similar Populations
- Wading River, NY R+22
- Castle Hayne, NC R+13
- Old Forge, PA R+5
- Dock Junction, GA Even
- Barbourville, KY R+57
- Clear Lake, IA R+31
- Fort Stewart, GA R+7
- Gray Court, SC R+56
- Maplewood, MO D+57
- August, CA D+15
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Oregon Secretary of State, Elections Division, 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.