| | Riverview, DE | Clayton, DE | United States |
| Population | 2,091 | 3,845 | 329,725,481 |
| Female Population | 55.8% | 50.4% | 50.5% |
| Male Population | 44.2% | 49.6% | 49.5% |
| Median Age | 51.7 | 35.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,623 | 2,946 | 309,327,143 |
| Population - 2000 | 1,583 | 1,273 | 285,036,114 |
| Population - 1990 | 1,138 | 1,163 | 251,960,433 |
| Pop. 2000 to Now | 82.6% | 185.2% | 15.6% |
| Pop. 1990 to Now | 154.0% | 212.1% | 30.8% |
| space4 | | | |
| Population Density | 579.1 | 2,014.1 | 93.4 |
| Land Area | 3.6 | 1.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Riverview, DE | Clayton, DE | United States |
| Age 0 to 4 | 2.5% | 7.5% | 5.9% |
| Age 5 to 9 | 0.6% | 12.0% | 6.1% |
| Age 10 to 14 | 4.8% | 9.0% | 6.6% |
| Age 15 to 17 | 8.2% | 5.6% | 3.9% |
| Age 18 to 20 | 0.3% | 3.6% | 4.0% |
| Age 21 to 24 | 2.4% | 2.7% | 5.2% |
| Age 25 to 34 | 5.5% | 7.5% | 13.8% |
| Age 35 to 44 | 9.4% | 16.7% | 12.9% |
| Age 45 to 54 | 17.7% | 15.5% | 12.6% |
| Age 55 to 59 | 17.3% | 4.1% | 6.7% |
| Age 60 to 64 | 10.3% | 6.7% | 6.3% |
| Age 65 to 74 | 17.3% | 5.9% | 9.6% |
| Age 75 to 84 | 0.5% | 1.9% | 4.5% |
| Age 85 and over | 3.2% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Riverview, DE | Clayton, DE | United States |
| White | 89.1% | 49.8% | 59.4% |
| Black | 5.5% | 33.8% | 12.2% |
| Asian | 1.0% | 2.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 4.4% | 3.6% | 3.2% |
| Hispanic | 0.0% | 9.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Riverview, DE | Clayton, DE | United States |
| Married Population | 73.4% | 51.8% | 49.8% |
| Currently Married | 73.4% | 49.9% | 48.0% |
| Married but Separated | 0.0% | 1.9% | 1.8% |
| Single Population | 26.6% | 48.2% | 50.2% |
| Never Married | 19.2% | 30.8% | 33.8% |
| Divorced | 6.0% | 10.8% | 10.8% |
| Widowed | 1.4% | 6.6% | 5.6% |
| space5 | | | |
| Household Size | 2.38 | 3.41 | 2.60 |
| Households | 879 | 1,128 | 124,010,992 |
| Family Households | 831 | 922 | 80,755,759 |
| Married couple, w/children | 20.3% | 45.9% | 30.5% |
| Married couple, no children | 71.4% | 23.0% | 42.9% |
| Non Family Households | 48 | 206 | 43,255,233 |
| Single householder, w/children | 0.0% | 22.2% | 15.8% |
| Single householder, no children | 8.3% | 8.9% | 10.8% |