| | Mardela Springs, MD | Hurlock, MD | United States |
| Population | 480 | 2,239 | 329,725,481 |
| Female Population | 61.5% | 55.9% | 50.5% |
| Male Population | 38.5% | 44.1% | 49.5% |
| Median Age | 32.4 | 38.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 347 | 2,092 | 309,327,143 |
| Population - 2000 | 364 | 1,874 | 285,036,114 |
| Population - 1990 | 360 | 1,706 | 251,960,433 |
| Pop. 2000 to Now | -3.6% | 7.1% | 15.6% |
| Pop. 1990 to Now | -2.5% | 17.6% | 30.8% |
| space4 | | | |
| Population Density | 1,182.3 | 839.2 | 93.4 |
| Land Area | 0.4 | 2.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mardela Springs, MD | Hurlock, MD | United States |
| Age 0 to 4 | 17.5% | 6.5% | 5.9% |
| Age 5 to 9 | 1.9% | 3.0% | 6.1% |
| Age 10 to 14 | 8.5% | 8.7% | 6.6% |
| Age 15 to 17 | 2.3% | 5.1% | 3.9% |
| Age 18 to 20 | 5.6% | 8.8% | 4.0% |
| Age 21 to 24 | 3.5% | 4.8% | 5.2% |
| Age 25 to 34 | 13.8% | 9.2% | 13.8% |
| Age 35 to 44 | 8.8% | 11.4% | 12.9% |
| Age 45 to 54 | 16.7% | 12.0% | 12.6% |
| Age 55 to 59 | 7.5% | 5.6% | 6.7% |
| Age 60 to 64 | 5.0% | 5.5% | 6.3% |
| Age 65 to 74 | 5.8% | 13.3% | 9.6% |
| Age 75 to 84 | 2.9% | 5.3% | 4.5% |
| Age 85 and over | 0.2% | 0.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mardela Springs, MD | Hurlock, MD | United States |
| White | 71.3% | 49.3% | 59.4% |
| Black | 10.2% | 36.0% | 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% | 1.0% | 0.4% |
| Two or More Races | 6.9% | 2.1% | 3.2% |
| Hispanic | 11.7% | 9.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mardela Springs, MD | Hurlock, MD | United States |
| Married Population | 53.8% | 40.5% | 49.8% |
| Currently Married | 50.3% | 39.1% | 48.0% |
| Married but Separated | 3.5% | 1.4% | 1.8% |
| Single Population | 46.2% | 59.5% | 50.2% |
| Never Married | 19.9% | 38.3% | 33.8% |
| Divorced | 22.0% | 15.0% | 10.8% |
| Widowed | 4.3% | 6.2% | 5.6% |
| space5 | | | |
| Household Size | 2.98 | 2.83 | 2.60 |
| Households | 161 | 783 | 124,010,992 |
| Family Households | 125 | 504 | 80,755,759 |
| Married couple, w/children | 31.2% | 20.0% | 30.5% |
| Married couple, no children | 35.2% | 45.8% | 42.9% |
| Non Family Households | 36 | 279 | 43,255,233 |
| Single householder, w/children | 22.4% | 22.6% | 15.8% |
| Single householder, no children | 11.2% | 11.5% | 10.8% |