| | Crownsville, MD | Hammond, LA | United States |
| Population | 1,273 | 19,374 | 329,725,481 |
| Female Population | 48.0% | 52.4% | 50.5% |
| Male Population | 52.0% | 47.6% | 49.5% |
| Median Age | 60.1 | 27.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,926 | 19,603 | 309,327,143 |
| Population - 2000 | 1,670 | 17,639 | 285,036,114 |
| Population - 1990 | 1,514 | 15,871 | 251,960,433 |
| Pop. 2000 to Now | 4.1% | 21.1% | 15.6% |
| Pop. 1990 to Now | 14.8% | 34.6% | 30.8% |
| space4 | | | |
| Population Density | 250.1 | 1,381.4 | 93.4 |
| Land Area | 5.1 | 14.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Crownsville, MD | Hammond, LA | United States |
| Age 0 to 4 | 1.9% | 5.1% | 5.9% |
| Age 5 to 9 | 1.3% | 5.8% | 6.1% |
| Age 10 to 14 | 3.8% | 7.5% | 6.6% |
| Age 15 to 17 | 3.6% | 3.9% | 3.9% |
| Age 18 to 20 | 2.0% | 13.2% | 4.0% |
| Age 21 to 24 | 0.6% | 10.3% | 5.2% |
| Age 25 to 34 | 8.0% | 13.9% | 13.8% |
| Age 35 to 44 | 4.7% | 11.1% | 12.9% |
| Age 45 to 54 | 13.1% | 6.6% | 12.6% |
| Age 55 to 59 | 10.5% | 4.7% | 6.7% |
| Age 60 to 64 | 16.3% | 5.4% | 6.3% |
| Age 65 to 74 | 16.3% | 7.2% | 9.6% |
| Age 75 to 84 | 14.3% | 4.5% | 4.5% |
| Age 85 and over | 3.5% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Crownsville, MD | Hammond, LA | United States |
| White | 87.4% | 46.7% | 59.4% |
| Black | 5.4% | 44.2% | 12.2% |
| Asian | 0.0% | 1.7% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 0.6% | 0.6% | 3.2% |
| Hispanic | 6.6% | 6.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Crownsville, MD | Hammond, LA | United States |
| Married Population | 54.1% | 28.7% | 49.8% |
| Currently Married | 54.1% | 26.1% | 48.0% |
| Married but Separated | 0.0% | 2.6% | 1.8% |
| Single Population | 45.9% | 71.3% | 50.2% |
| Never Married | 28.6% | 54.7% | 33.8% |
| Divorced | 5.2% | 10.7% | 10.8% |
| Widowed | 12.1% | 5.9% | 5.6% |
| space5 | | | |
| Household Size | 2.19 | 2.56 | 2.60 |
| Households | 513 | 6,497 | 124,010,992 |
| Family Households | 308 | 3,581 | 80,755,759 |
| Married couple, w/children | 22.7% | 19.9% | 30.5% |
| Married couple, no children | 77.3% | 32.3% | 42.9% |
| Non Family Households | 205 | 2,916 | 43,255,233 |
| Single householder, w/children | 0.0% | 33.3% | 15.8% |
| Single householder, no children | 0.0% | 14.5% | 10.8% |