| | Crockett, CA | Cumberland, MD | United States |
| Population | 3,405 | 19,028 | 329,725,481 |
| Female Population | 53.7% | 51.5% | 50.5% |
| Male Population | 46.3% | 48.6% | 49.5% |
| Median Age | 47 | 40.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,298 | 20,808 | 309,327,143 |
| Population - 2000 | 3,194 | 21,518 | 285,036,114 |
| Population - 1990 | 3,228 | 23,706 | 251,960,433 |
| Pop. 2000 to Now | 0.9% | -11.1% | 15.6% |
| Pop. 1990 to Now | -0.2% | -19.3% | 30.8% |
| space4 | | | |
| Population Density | 3,206.2 | 1,892.6 | 93.4 |
| Land Area | 1.1 | 10.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Crockett, CA | Cumberland, MD | United States |
| Age 0 to 4 | 3.1% | 5.1% | 5.9% |
| Age 5 to 9 | 4.4% | 5.6% | 6.1% |
| Age 10 to 14 | 4.2% | 6.4% | 6.6% |
| Age 15 to 17 | 4.4% | 3.2% | 3.9% |
| Age 18 to 20 | 3.1% | 7.0% | 4.0% |
| Age 21 to 24 | 2.8% | 5.2% | 5.2% |
| Age 25 to 34 | 10.5% | 10.0% | 13.8% |
| Age 35 to 44 | 15.4% | 12.3% | 12.9% |
| Age 45 to 54 | 14.9% | 10.7% | 12.6% |
| Age 55 to 59 | 10.4% | 5.4% | 6.7% |
| Age 60 to 64 | 8.6% | 6.6% | 6.3% |
| Age 65 to 74 | 11.7% | 11.9% | 9.6% |
| Age 75 to 84 | 4.1% | 6.9% | 4.5% |
| Age 85 and over | 2.3% | 3.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Crockett, CA | Cumberland, MD | United States |
| White | 63.5% | 88.9% | 59.4% |
| Black | 9.5% | 4.3% | 12.2% |
| Asian | 3.3% | 0.7% | 5.6% |
| Native American | 0.3% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.2% | 0.4% |
| Two or More Races | 2.4% | 3.8% | 3.2% |
| Hispanic | 20.6% | 2.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Crockett, CA | Cumberland, MD | United States |
| Married Population | 43.1% | 39.6% | 49.8% |
| Currently Married | 42.0% | 37.5% | 48.0% |
| Married but Separated | 1.1% | 2.1% | 1.8% |
| Single Population | 56.9% | 60.4% | 50.2% |
| Never Married | 34.2% | 32.9% | 33.8% |
| Divorced | 16.2% | 17.8% | 10.8% |
| Widowed | 6.5% | 9.6% | 5.6% |
| space5 | | | |
| Household Size | 2.25 | 2.11 | 2.60 |
| Households | 1,516 | 8,429 | 124,010,992 |
| Family Households | 777 | 4,276 | 80,755,759 |
| Married couple, w/children | 33.5% | 24.8% | 30.5% |
| Married couple, no children | 45.0% | 39.7% | 42.9% |
| Non Family Households | 739 | 4,153 | 43,255,233 |
| Single householder, w/children | 8.9% | 26.5% | 15.8% |
| Single householder, no children | 12.6% | 9.0% | 10.8% |