| Statistic | Seabrook Beach | New Hampshire | National |
| Population | 976 | 1,359,711 | 328,239,523 |
| Population density (sq mi) | 932 | 153 | 91 |
| Median age | 54.7 | 42.4 | 37.7 |
| Male/Female ratio | 1.1:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 58% | 58% | 55% |
| Families w/ Kids under 18 | 29% | 40% | 43% |
| Speak English | 95% | 92% | 79% |
| Speak Spanish | 0% | 2% | 13% |
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| Race | Seabrook Beach | New Hampshire | National |
| White | 99.39% | 93.68% | 73.35% |
| Black | 0.00% | 1.32% | 12.63% |
| Asian | 0.00% | 2.42% | 5.22% |
| American Indian | 0.00% | 0.16% | 0.82% |
| Native Hawaiian | 0.00% | 0.02% | 0.18% |
| Mixed race | 0.61% | 1.88% | 3.06% |
| Other race | 0.00% | 0.54% | 4.75% |
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