| | Elsmere, DE | Claymont, DE | United States |
| Population | 6,167 | 9,508 | 329,725,481 |
| Female Population | 49.7% | 48.4% | 50.5% |
| Male Population | 50.3% | 51.6% | 49.5% |
| Median Age | 34.1 | 36.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,970 | 7,511 | 309,327,143 |
| Population - 2000 | 5,800 | 9,220 | 285,036,114 |
| Population - 1990 | 5,935 | 9,800 | 251,960,433 |
| Pop. 2000 to Now | -0.7% | -4.3% | 15.6% |
| Pop. 1990 to Now | -2.9% | -9.9% | 30.8% |
| space4 | | | |
| Population Density | 6,130.2 | 4,422.3 | 93.4 |
| Land Area | 1.0 | 2.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Elsmere, DE | Claymont, DE | United States |
| Age 0 to 4 | 4.4% | 5.1% | 5.9% |
| Age 5 to 9 | 8.7% | 6.0% | 6.1% |
| Age 10 to 14 | 5.9% | 5.5% | 6.6% |
| Age 15 to 17 | 7.8% | 1.9% | 3.9% |
| Age 18 to 20 | 4.4% | 2.7% | 4.0% |
| Age 21 to 24 | 3.6% | 3.5% | 5.2% |
| Age 25 to 34 | 17.5% | 23.1% | 13.8% |
| Age 35 to 44 | 14.2% | 11.8% | 12.9% |
| Age 45 to 54 | 10.7% | 13.1% | 12.6% |
| Age 55 to 59 | 5.8% | 6.2% | 6.7% |
| Age 60 to 64 | 6.7% | 7.1% | 6.3% |
| Age 65 to 74 | 6.8% | 9.8% | 9.6% |
| Age 75 to 84 | 2.8% | 3.1% | 4.5% |
| Age 85 and over | 0.8% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Elsmere, DE | Claymont, DE | United States |
| White | 56.1% | 53.3% | 59.4% |
| Black | 13.2% | 28.4% | 12.2% |
| Asian | 1.2% | 6.1% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 3.2% | 3.2% |
| Hispanic | 28.5% | 8.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Elsmere, DE | Claymont, DE | United States |
| Married Population | 31.1% | 43.5% | 49.8% |
| Currently Married | 30.1% | 42.7% | 48.0% |
| Married but Separated | 1.0% | 0.8% | 1.8% |
| Single Population | 68.9% | 56.5% | 50.2% |
| Never Married | 49.9% | 39.2% | 33.8% |
| Divorced | 13.9% | 10.8% | 10.8% |
| Widowed | 5.1% | 6.5% | 5.6% |
| space5 | | | |
| Household Size | 2.67 | 2.32 | 2.60 |
| Households | 2,304 | 4,097 | 124,010,992 |
| Family Households | 1,311 | 2,094 | 80,755,759 |
| Married couple, w/children | 23.9% | 28.8% | 30.5% |
| Married couple, no children | 25.8% | 45.4% | 42.9% |
| Non Family Households | 993 | 2,003 | 43,255,233 |
| Single householder, w/children | 29.2% | 9.6% | 15.8% |
| Single householder, no children | 21.1% | 16.1% | 10.8% |