| | Derby Line, VT | Kittery, ME | United States |
| Population | 753 | 10,006 | 329,725,481 |
| Female Population | 62.2% | 52.4% | 50.5% |
| Male Population | 37.9% | 47.6% | 49.5% |
| Median Age | 42 | 51.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 674 | 9,498 | 309,327,143 |
| Population - 2000 | 776 | 9,543 | 285,036,114 |
| Population - 1990 | 855 | 9,372 | 251,960,433 |
| Pop. 2000 to Now | -20.8% | 3.5% | 15.6% |
| Pop. 1990 to Now | -28.1% | 5.4% | 30.8% |
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| Population Density | 1,040.1 | 562.7 | 93.4 |
| Land Area | 0.7 | 17.8 | 3,531,905.4 |
| Water Area | 0.0 | 57.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Derby Line, VT | Kittery, ME | United States |
| Age 0 to 4 | 10.5% | 4.4% | 5.9% |
| Age 5 to 9 | 6.9% | 4.0% | 6.1% |
| Age 10 to 14 | 3.1% | 2.7% | 6.6% |
| Age 15 to 17 | 9.4% | 1.6% | 3.9% |
| Age 18 to 20 | 2.4% | 2.3% | 4.0% |
| Age 21 to 24 | 4.1% | 5.0% | 5.2% |
| Age 25 to 34 | 8.9% | 12.4% | 13.8% |
| Age 35 to 44 | 12.6% | 9.3% | 12.9% |
| Age 45 to 54 | 9.2% | 14.9% | 12.6% |
| Age 55 to 59 | 5.7% | 7.7% | 6.7% |
| Age 60 to 64 | 3.2% | 8.0% | 6.3% |
| Age 65 to 74 | 9.4% | 14.2% | 9.6% |
| Age 75 to 84 | 14.2% | 4.5% | 4.5% |
| Age 85 and over | 0.4% | 9.0% | 1.9% |
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| Race | | | |
| | Derby Line, VT | Kittery, ME | United States |
| White | 91.2% | 90.3% | 59.4% |
| Black | 0.0% | 2.2% | 12.2% |
| Asian | 0.0% | 1.2% | 5.6% |
| Native American | 0.0% | 0.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 6.9% | 1.9% | 3.2% |
| Hispanic | 1.9% | 3.4% | 18.4% |
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| Marriage & Family | | | |
| | Derby Line, VT | Kittery, ME | United States |
| Married Population | 45.2% | 49.9% | 49.8% |
| Currently Married | 45.2% | 49.3% | 48.0% |
| Married but Separated | 0.0% | 0.7% | 1.8% |
| Single Population | 54.8% | 50.1% | 50.2% |
| Never Married | 30.4% | 24.6% | 33.8% |
| Divorced | 13.0% | 16.4% | 10.8% |
| Widowed | 11.4% | 9.1% | 5.6% |
| space5 | | | |
| Household Size | 2.05 | 1.98 | 2.60 |
| Households | 367 | 4,962 | 124,010,992 |
| Family Households | 222 | 2,712 | 80,755,759 |
| Married couple, w/children | 22.1% | 25.3% | 30.5% |
| Married couple, no children | 39.6% | 57.1% | 42.9% |
| Non Family Households | 145 | 2,250 | 43,255,233 |
| Single householder, w/children | 37.4% | 9.1% | 15.8% |
| Single householder, no children | 0.9% | 8.4% | 10.8% |