| | North Berwick, ME | Millerton, PA | United States |
| Population | 4,950 | 403 | 329,725,481 |
| Female Population | 54.0% | 51.4% | 50.5% |
| Male Population | 46.0% | 48.6% | 49.5% |
| Median Age | 46.9 | 52.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,579 | 308 | 309,327,143 |
| Population - 2000 | 4,293 | 283 | 285,036,114 |
| Population - 1990 | 3,793 | 280 | 251,960,433 |
| Pop. 2000 to Now | 10.5% | 5.0% | 15.6% |
| Pop. 1990 to Now | 25.1% | 6.1% | 30.8% |
| space4 | | | |
| Population Density | 130.2 | 470.3 | 93.4 |
| Land Area | 38.0 | 0.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | North Berwick, ME | Millerton, PA | United States |
| Age 0 to 4 | 6.0% | 0.0% | 5.9% |
| Age 5 to 9 | 3.9% | 6.2% | 6.1% |
| Age 10 to 14 | 7.8% | 1.7% | 6.6% |
| Age 15 to 17 | 3.6% | 0.5% | 3.9% |
| Age 18 to 20 | 3.8% | 3.7% | 4.0% |
| Age 21 to 24 | 2.6% | 4.5% | 5.2% |
| Age 25 to 34 | 12.3% | 10.9% | 13.8% |
| Age 35 to 44 | 8.1% | 5.2% | 12.9% |
| Age 45 to 54 | 14.1% | 30.3% | 12.6% |
| Age 55 to 59 | 7.1% | 10.7% | 6.7% |
| Age 60 to 64 | 7.5% | 8.2% | 6.3% |
| Age 65 to 74 | 14.6% | 9.9% | 9.6% |
| Age 75 to 84 | 6.3% | 7.4% | 4.5% |
| Age 85 and over | 2.4% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | North Berwick, ME | Millerton, PA | United States |
| White | 93.3% | 95.0% | 59.4% |
| Black | 0.6% | 0.0% | 12.2% |
| Asian | 0.3% | 4.0% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.6% | 0.7% | 3.2% |
| Hispanic | 2.2% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | North Berwick, ME | Millerton, PA | United States |
| Married Population | 56.9% | 60.6% | 49.8% |
| Currently Married | 56.3% | 57.4% | 48.0% |
| Married but Separated | 0.7% | 3.2% | 1.8% |
| Single Population | 43.1% | 39.4% | 50.2% |
| Never Married | 22.4% | 30.5% | 33.8% |
| Divorced | 14.1% | 5.1% | 10.8% |
| Widowed | 6.5% | 3.8% | 5.6% |
| space5 | | | |
| Household Size | 2.50 | 2.50 | 2.60 |
| Households | 1,954 | 161 | 124,010,992 |
| Family Households | 1,406 | 124 | 80,755,759 |
| Married couple, w/children | 27.9% | 4.0% | 30.5% |
| Married couple, no children | 50.0% | 80.6% | 42.9% |
| Non Family Households | 548 | 37 | 43,255,233 |
| Single householder, w/children | 14.6% | 13.7% | 15.8% |
| Single householder, no children | 7.5% | 1.6% | 10.8% |