| | Vienna, MD | Mardela Springs, MD | United States |
| Population | 424 | 480 | 329,725,481 |
| Female Population | 54.7% | 61.5% | 50.5% |
| Male Population | 45.3% | 38.5% | 49.5% |
| Median Age | 39 | 32.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 278 | 347 | 309,327,143 |
| Population - 2000 | 280 | 364 | 285,036,114 |
| Population - 1990 | 264 | 360 | 251,960,433 |
| Pop. 2000 to Now | -5.7% | -3.6% | 15.6% |
| Pop. 1990 to Now | 0.0% | -2.5% | 30.8% |
| space4 | | | |
| Population Density | 557.2 | 1,182.3 | 93.4 |
| Land Area | 0.8 | 0.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Vienna, MD | Mardela Springs, MD | United States |
| Age 0 to 4 | 11.6% | 17.5% | 5.9% |
| Age 5 to 9 | 3.8% | 1.9% | 6.1% |
| Age 10 to 14 | 2.8% | 8.5% | 6.6% |
| Age 15 to 17 | 5.9% | 2.3% | 3.9% |
| Age 18 to 20 | 4.5% | 5.6% | 4.0% |
| Age 21 to 24 | 2.1% | 3.5% | 5.2% |
| Age 25 to 34 | 17.9% | 13.8% | 13.8% |
| Age 35 to 44 | 4.7% | 8.8% | 12.9% |
| Age 45 to 54 | 11.1% | 16.7% | 12.6% |
| Age 55 to 59 | 13.7% | 7.5% | 6.7% |
| Age 60 to 64 | 9.0% | 5.0% | 6.3% |
| Age 65 to 74 | 5.0% | 5.8% | 9.6% |
| Age 75 to 84 | 5.9% | 2.9% | 4.5% |
| Age 85 and over | 2.1% | 0.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Vienna, MD | Mardela Springs, MD | United States |
| White | 70.8% | 71.3% | 59.4% |
| Black | 9.2% | 10.2% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.6% | 6.9% | 3.2% |
| Hispanic | 17.5% | 11.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Vienna, MD | Mardela Springs, MD | United States |
| Married Population | 49.0% | 53.8% | 49.8% |
| Currently Married | 48.1% | 50.3% | 48.0% |
| Married but Separated | 0.9% | 3.5% | 1.8% |
| Single Population | 51.0% | 46.2% | 50.2% |
| Never Married | 29.4% | 19.9% | 33.8% |
| Divorced | 14.4% | 22.0% | 10.8% |
| Widowed | 7.2% | 4.3% | 5.6% |
| space5 | | | |
| Household Size | 3.03 | 2.98 | 2.60 |
| Households | 140 | 161 | 124,010,992 |
| Family Households | 108 | 125 | 80,755,759 |
| Married couple, w/children | 21.3% | 31.2% | 30.5% |
| Married couple, no children | 49.1% | 35.2% | 42.9% |
| Non Family Households | 32 | 36 | 43,255,233 |
| Single householder, w/children | 13.9% | 22.4% | 15.8% |
| Single householder, no children | 15.7% | 11.2% | 10.8% |