Seabrook leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican. These figures are model estimates: New Hampshire did not have precinct-level voting records available for training, so the numbers above come from demographic and health features rather than local ground truth.
About 77% of adults in Seabrook typically vote, above the U.S. average of about 62%. Among adults in Seabrook, ~36% vote Democratic, ~41% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How Seabrook compares
Among cities within 25 miles, Seabrook leans more Republican than 77 of 90 neighbors.
Seabrook runs about 8 points more Republican than New Hampshire as a whole.
Politics vary noticeably by neighborhood within Seabrook. The northeast side runs the most Democratic (D+13) and the south side runs the most Republican (R+9), a spread of about 22 points.
Why Seabrook leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Seabrook. None of them point strongly toward either party.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Seabrook, NH sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Seabrook looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Seabrook 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 68%, about 8 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Salisbury, MA D+2
- Hampton Falls, NH D+7
- Hampton, NH D+14
- Amesbury Town, MA D+22
- Newburyport, MA D+37
- South Hampton, NH Even
- Plum Island, MA D+21
- North Hampton Center, NH D+9
- Newbury, MA D+25
Cities with Similar Populations
- Nitro, WV R+27
- Jasper, FL R+12
- Calhoun, LA R+80
- Greenfield, OH R+52
- Mountain Grove, MO R+65
- Rusk, TX R+39
- Berne, IN R+63
- Lauderdale-by-the-Sea, FL R+14
- Brookville, IN R+61
- Fircrest, WA D+34
Sources and methodology
Precinct-level voting records used to fit the model come from New Hampshire 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. NH did not have precinct-level voting records available for training, so the figures here come from extrapolation across demographic, health, and land-use features rather than local ground truth. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.