Seabrook is a Democratic stronghold. About 85% of voters here vote Democratic and 15% Republican.
About 59% of adults in Seabrook typically vote, near the U.S. average of about 62%. Among adults in Seabrook, ~50% vote Democratic, ~9% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How Seabrook compares
Among cities within 25 miles, Seabrook leans more Democratic than 161 of 204 neighbors.
Seabrook runs about 40 points more Democratic than Maryland as a whole.
Politics vary noticeably by neighborhood within Seabrook. The northeast side is the most Democratic-leaning (D+77) and the southwest side is the least Democratic-leaning (D+55), a spread of about 23 points.
Why Seabrook 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 Seabrook, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 96% of residents in Seabrook live in densely developed areas, about 60 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Seabrook sits in the top quarter (about 31%, above 76% of cities). A high never-married share predicts Democratic voting, and about 42% of adults in Seabrook have never been married, above 95% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Seabrook, MD sits in the top tenth nationally on this measure.
Why turnout in Seabrook looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Seabrook is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 29% of households in Seabrook rent, above 83% of cities. High food insecurity lines up with lower turnout, and about 24% of adults in Seabrook report food insecurity, above 89% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Lanham, MD D+68
- New Carrollton, MD D+70
- Glenn Dale, MD D+71
- Greenbelt, MD D+69
- Riverdale, MD D+63
- Berwyn Heights, MD D+47
- Landover Hills, MD D+60
- Mitchellville, MD D+83
- Glenarden, MD D+81
- East Riverdale, MD D+56
Cities with Similar Populations
- Bryn Mawr-Skyway, WA D+48
- Washington Court House, OH R+50
- Chehalis, WA R+27
- Wexford, PA Even
- Kirksville, MO R+9
- Universal City, TX R+2
- Westwood, NJ D+3
- Greenfield, CA D+28
- Caldwell, NJ Even
- Riverton, NJ D+10
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Sources and methodology
Precinct-level voting records used to fit the model come from Maryland State Board of 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.