| | Seabrook Beach, NH | Lawrence, MA | United States |
| Population | 863 | 87,798 | 329,725,481 |
| Female Population | 47.1% | 50.2% | 50.5% |
| Male Population | 53.0% | 49.8% | 49.5% |
| Median Age | 59.8 | 32.2 | 38.4 |
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| Population - 2010 | 1,540 | 76,552 | 309,327,143 |
| Population - 2000 | 1,136 | 72,043 | 285,036,114 |
| Population - 1990 | 976 | 70,207 | 251,960,433 |
| Pop. 2000 to Now | -15.7% | 11.1% | 15.6% |
| Pop. 1990 to Now | -1.8% | 14.0% | 30.8% |
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| Population Density | 824.3 | 12,667.4 | 93.4 |
| Land Area | 1.0 | 6.9 | 3,531,905.4 |
| Water Area | 0.4 | 0.5 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Seabrook Beach, NH | Lawrence, MA | United States |
| Age 0 to 4 | 3.6% | 7.9% | 5.9% |
| Age 5 to 9 | 0.0% | 7.2% | 6.1% |
| Age 10 to 14 | 0.6% | 7.7% | 6.6% |
| Age 15 to 17 | 2.4% | 4.5% | 3.9% |
| Age 18 to 20 | 0.7% | 4.6% | 4.0% |
| Age 21 to 24 | 1.5% | 6.2% | 5.2% |
| Age 25 to 34 | 2.9% | 16.6% | 13.8% |
| Age 35 to 44 | 2.5% | 13.3% | 12.9% |
| Age 45 to 54 | 17.0% | 11.4% | 12.6% |
| Age 55 to 59 | 19.1% | 5.9% | 6.7% |
| Age 60 to 64 | 11.0% | 4.6% | 6.3% |
| Age 65 to 74 | 24.2% | 5.9% | 9.6% |
| Age 75 to 84 | 14.1% | 2.7% | 4.5% |
| Age 85 and over | 0.2% | 1.6% | 1.9% |
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| Race | | | |
| | Seabrook Beach, NH | Lawrence, MA | United States |
| White | 97.2% | 13.2% | 59.4% |
| Black | 0.0% | 1.9% | 12.2% |
| Asian | 0.0% | 1.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.6% | 0.4% |
| Two or More Races | 0.0% | 0.4% | 3.2% |
| Hispanic | 2.8% | 82.3% | 18.4% |
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| Marriage & Family | | | |
| | Seabrook Beach, NH | Lawrence, MA | United States |
| Married Population | 57.7% | 38.5% | 49.8% |
| Currently Married | 57.7% | 34.1% | 48.0% |
| Married but Separated | 0.0% | 4.4% | 1.8% |
| Single Population | 42.3% | 61.5% | 50.2% |
| Never Married | 12.6% | 46.4% | 33.8% |
| Divorced | 21.6% | 10.9% | 10.8% |
| Widowed | 8.1% | 4.2% | 5.6% |
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| Household Size | 1.78 | 2.86 | 2.60 |
| Households | 486 | 30,291 | 124,010,992 |
| Family Households | 279 | 20,801 | 80,755,759 |
| Married couple, w/children | 13.3% | 23.3% | 30.5% |
| Married couple, no children | 69.5% | 22.6% | 42.9% |
| Non Family Households | 207 | 9,490 | 43,255,233 |
| Single householder, w/children | 6.8% | 35.5% | 15.8% |
| Single householder, no children | 10.4% | 18.7% | 10.8% |