Seal Beach is a true toss-up. About 52% of voters here vote Democratic and 48% Republican.
About 74% of adults in Seal Beach typically vote, above the U.S. average of about 62%. Among adults in Seal Beach, ~38% vote Democratic, ~36% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Seal Beach compares
Among cities within 25 miles, Seal Beach leans more Democratic than 22 of 117 neighbors.
Seal Beach runs about 16 points more Republican than California as a whole.
Politics vary noticeably by neighborhood within Seal Beach. The southwest side runs the most Democratic (D+15) and the southeast side runs the most Republican (R+19), a spread of about 34 points.
Why Seal Beach leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Seal Beach. The lean here lands roughly where demographic data alone would predict.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Seal Beach, CA sits in the top tenth nationally on this measure.
Why turnout in Seal Beach looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Seal Beach 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 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Seal Beach have completed high school, above 81% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Rossmoor, CA Even
- Los Alamitos, CA Even
- Sunset Beach, CA R+15
- Hawaiian Gardens, CA D+27
- Cypress, CA D+3
- Signal Hill, CA D+34
- Westminster, CA R+5
- Long Beach, CA D+40
- Midway City, CA R+8
- Stanton, CA D+6
Cities with Similar Populations
- Ashtabula, OH R+12
- Clarksburg, MD D+39
- Mount Holly, NJ D+23
- Shirley, NY R+19
- White Bear Lake, MN D+20
- Calabasas, CA D+14
- Allison Park, PA Even
- Milford Mill, MD D+81
- Grayson, GA D+27
- New Albany, OH D+11
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from California 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.