| | Millsboro, PA | Townsend, DE | United States |
| Population | 374 | 2,671 | 329,725,481 |
| Female Population | 54.8% | 51.8% | 50.5% |
| Male Population | 45.2% | 48.2% | 49.5% |
| Median Age | 34.9 | 34 | 38.4 |
| space3 | | | |
| Population - 2010 | 465 | 2,042 | 309,327,143 |
| Population - 2000 | 717 | 346 | 285,036,114 |
| Population - 1990 | 748 | 322 | 251,960,433 |
| Pop. 2000 to Now | -18.4% | 698.8% | 15.6% |
| Pop. 1990 to Now | -21.8% | 758.4% | 30.8% |
| space4 | | | |
| Population Density | 474.6 | 2,546.2 | 93.4 |
| Land Area | 0.8 | 1.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Millsboro, PA | Townsend, DE | United States |
| Age 0 to 4 | 5.1% | 6.7% | 5.9% |
| Age 5 to 9 | 4.5% | 9.6% | 6.1% |
| Age 10 to 14 | 1.6% | 13.8% | 6.6% |
| Age 15 to 17 | 7.8% | 4.5% | 3.9% |
| Age 18 to 20 | 23.3% | 1.7% | 4.0% |
| Age 21 to 24 | 1.1% | 2.4% | 5.2% |
| Age 25 to 34 | 7.2% | 13.3% | 13.8% |
| Age 35 to 44 | 21.4% | 16.0% | 12.9% |
| Age 45 to 54 | 21.1% | 23.2% | 12.6% |
| Age 55 to 59 | 6.2% | 3.2% | 6.7% |
| Age 60 to 64 | 0.0% | 1.8% | 6.3% |
| Age 65 to 74 | 0.8% | 2.9% | 9.6% |
| Age 75 to 84 | 0.0% | 0.8% | 4.5% |
| Age 85 and over | 0.0% | 0.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Millsboro, PA | Townsend, DE | United States |
| White | 100.0% | 44.7% | 59.4% |
| Black | 0.0% | 36.8% | 12.2% |
| Asian | 0.0% | 2.5% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 0.0% | 9.5% | 3.2% |
| Hispanic | 0.0% | 6.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Millsboro, PA | Townsend, DE | United States |
| Married Population | 57.8% | 56.1% | 49.8% |
| Currently Married | 53.3% | 55.2% | 48.0% |
| Married but Separated | 4.5% | 0.9% | 1.8% |
| Single Population | 42.2% | 43.9% | 50.2% |
| Never Married | 42.2% | 31.9% | 33.8% |
| Divorced | 0.0% | 10.7% | 10.8% |
| Widowed | 0.0% | 1.4% | 5.6% |
| space5 | | | |
| Household Size | 3.04 | 3.77 | 2.60 |
| Households | 123 | 706 | 124,010,992 |
| Family Households | 100 | 522 | 80,755,759 |
| Married couple, w/children | 40.0% | 60.0% | 30.5% |
| Married couple, no children | 48.0% | 22.6% | 42.9% |
| Non Family Households | 23 | 184 | 43,255,233 |
| Single householder, w/children | 12.0% | 11.7% | 15.8% |
| Single householder, no children | 0.0% | 5.7% | 10.8% |