| | Middletown, DE | Magnolia, DE | United States |
| Population | 23,001 | 350 | 329,725,481 |
| Female Population | 53.7% | 58.6% | 50.5% |
| Male Population | 46.3% | 41.4% | 49.5% |
| Median Age | 40.3 | 36.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 18,973 | 267 | 309,327,143 |
| Population - 2000 | 6,161 | 226 | 285,036,114 |
| Population - 1990 | 3,834 | 211 | 251,960,433 |
| Pop. 2000 to Now | 285.7% | 29.7% | 15.6% |
| Pop. 1990 to Now | 519.9% | 38.9% | 30.8% |
| space4 | | | |
| Population Density | 1,947.8 | 1,785.7 | 93.4 |
| Land Area | 11.8 | 0.2 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Middletown, DE | Magnolia, DE | United States |
| Age 0 to 4 | 5.0% | 4.9% | 5.9% |
| Age 5 to 9 | 6.8% | 11.4% | 6.1% |
| Age 10 to 14 | 10.1% | 4.3% | 6.6% |
| Age 15 to 17 | 4.8% | 5.4% | 3.9% |
| Age 18 to 20 | 2.7% | 3.1% | 4.0% |
| Age 21 to 24 | 3.3% | 0.3% | 5.2% |
| Age 25 to 34 | 11.6% | 19.1% | 13.8% |
| Age 35 to 44 | 13.0% | 9.7% | 12.9% |
| Age 45 to 54 | 12.5% | 8.3% | 12.6% |
| Age 55 to 59 | 4.7% | 6.9% | 6.7% |
| Age 60 to 64 | 6.7% | 6.3% | 6.3% |
| Age 65 to 74 | 9.1% | 13.4% | 9.6% |
| Age 75 to 84 | 7.8% | 6.6% | 4.5% |
| Age 85 and over | 2.0% | 0.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Middletown, DE | Magnolia, DE | United States |
| White | 57.7% | 62.0% | 59.4% |
| Black | 25.8% | 33.4% | 12.2% |
| Asian | 5.4% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 2.7% | 0.0% | 0.4% |
| Two or More Races | 3.3% | 2.3% | 3.2% |
| Hispanic | 5.1% | 2.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Middletown, DE | Magnolia, DE | United States |
| Married Population | 54.8% | 44.2% | 49.8% |
| Currently Married | 52.8% | 36.3% | 48.0% |
| Married but Separated | 2.0% | 7.9% | 1.8% |
| Single Population | 45.2% | 55.8% | 50.2% |
| Never Married | 26.8% | 36.3% | 33.8% |
| Divorced | 10.9% | 18.0% | 10.8% |
| Widowed | 7.6% | 1.4% | 5.6% |
| space5 | | | |
| Household Size | 2.61 | 3.07 | 2.60 |
| Households | 8,769 | 114 | 124,010,992 |
| Family Households | 6,098 | 71 | 80,755,759 |
| Married couple, w/children | 30.9% | 21.1% | 30.5% |
| Married couple, no children | 41.9% | 46.5% | 42.9% |
| Non Family Households | 2,671 | 43 | 43,255,233 |
| Single householder, w/children | 19.6% | 28.2% | 15.8% |
| Single householder, no children | 7.6% | 4.2% | 10.8% |