| | White Marsh, MD | Sioux Rapids, IA | United States |
| Population | 9,663 | 786 | 329,725,481 |
| Female Population | 51.2% | 49.0% | 50.5% |
| Male Population | 48.8% | 51.0% | 49.5% |
| Median Age | 39.9 | 50 | 38.4 |
| space3 | | | |
| Population - 2010 | 9,520 | 777 | 309,327,143 |
| Population - 2000 | 8,485 | 720 | 285,036,114 |
| Population - 1990 | 8,183 | 761 | 251,960,433 |
| Pop. 2000 to Now | 13.6% | 1.8% | 15.6% |
| Pop. 1990 to Now | 17.8% | -3.7% | 30.8% |
| space4 | | | |
| Population Density | 1,819.8 | 949.3 | 93.4 |
| Land Area | 5.3 | 0.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | White Marsh, MD | Sioux Rapids, IA | United States |
| Age 0 to 4 | 4.2% | 3.1% | 5.9% |
| Age 5 to 9 | 7.2% | 6.2% | 6.1% |
| Age 10 to 14 | 7.6% | 7.4% | 6.6% |
| Age 15 to 17 | 5.2% | 7.6% | 3.9% |
| Age 18 to 20 | 3.1% | 2.8% | 4.0% |
| Age 21 to 24 | 3.1% | 4.2% | 5.2% |
| Age 25 to 34 | 12.1% | 5.9% | 13.8% |
| Age 35 to 44 | 16.0% | 9.8% | 12.9% |
| Age 45 to 54 | 10.2% | 12.5% | 12.6% |
| Age 55 to 59 | 6.6% | 1.9% | 6.7% |
| Age 60 to 64 | 6.9% | 8.4% | 6.3% |
| Age 65 to 74 | 11.4% | 17.7% | 9.6% |
| Age 75 to 84 | 5.4% | 6.9% | 4.5% |
| Age 85 and over | 1.0% | 5.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | White Marsh, MD | Sioux Rapids, IA | United States |
| White | 66.7% | 90.2% | 59.4% |
| Black | 15.9% | 0.0% | 12.2% |
| Asian | 8.8% | 0.0% | 5.6% |
| Native American | 0.6% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.0% | 0.4% | 0.4% |
| Two or More Races | 2.0% | 2.8% | 3.2% |
| Hispanic | 5.1% | 6.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | White Marsh, MD | Sioux Rapids, IA | United States |
| Married Population | 54.7% | 53.1% | 49.8% |
| Currently Married | 53.7% | 53.1% | 48.0% |
| Married but Separated | 1.0% | 0.0% | 1.8% |
| Single Population | 45.3% | 46.9% | 50.2% |
| Never Married | 28.8% | 29.3% | 33.8% |
| Divorced | 10.9% | 13.6% | 10.8% |
| Widowed | 5.6% | 4.0% | 5.6% |
| space5 | | | |
| Household Size | 2.60 | 2.26 | 2.60 |
| Households | 3,709 | 338 | 124,010,992 |
| Family Households | 2,574 | 178 | 80,755,759 |
| Married couple, w/children | 30.7% | 25.3% | 30.5% |
| Married couple, no children | 44.4% | 62.9% | 42.9% |
| Non Family Households | 1,135 | 160 | 43,255,233 |
| Single householder, w/children | 17.6% | 9.6% | 15.8% |
| Single householder, no children | 7.3% | 2.2% | 10.8% |