| | Crockett, CA | Oakley, CA | United States |
| Population | 3,405 | 42,996 | 329,725,481 |
| Female Population | 53.7% | 49.1% | 50.5% |
| Male Population | 46.3% | 50.9% | 49.5% |
| Median Age | 47 | 35.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,298 | 35,638 | 309,327,143 |
| Population - 2000 | 3,194 | 25,619 | 285,036,114 |
| Population - 1990 | 3,228 | 18,374 | 251,960,433 |
| Pop. 2000 to Now | 0.9% | 66.7% | 15.6% |
| Pop. 1990 to Now | -0.2% | 132.5% | 30.8% |
| space4 | | | |
| Population Density | 3,206.2 | 2,710.5 | 93.4 |
| Land Area | 1.1 | 15.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Crockett, CA | Oakley, CA | United States |
| Age 0 to 4 | 3.1% | 7.7% | 5.9% |
| Age 5 to 9 | 4.4% | 8.2% | 6.1% |
| Age 10 to 14 | 4.2% | 7.8% | 6.6% |
| Age 15 to 17 | 4.4% | 4.3% | 3.9% |
| Age 18 to 20 | 3.1% | 3.9% | 4.0% |
| Age 21 to 24 | 2.8% | 5.3% | 5.2% |
| Age 25 to 34 | 10.5% | 11.9% | 13.8% |
| Age 35 to 44 | 15.4% | 15.2% | 12.9% |
| Age 45 to 54 | 14.9% | 12.8% | 12.6% |
| Age 55 to 59 | 10.4% | 6.9% | 6.7% |
| Age 60 to 64 | 8.6% | 6.6% | 6.3% |
| Age 65 to 74 | 11.7% | 6.9% | 9.6% |
| Age 75 to 84 | 4.1% | 2.0% | 4.5% |
| Age 85 and over | 2.3% | 0.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Crockett, CA | Oakley, CA | United States |
| White | 63.5% | 45.0% | 59.4% |
| Black | 9.5% | 8.4% | 12.2% |
| Asian | 3.3% | 7.3% | 5.6% |
| Native American | 0.3% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.9% | 0.2% |
| Other | 0.4% | 0.2% | 0.4% |
| Two or More Races | 2.4% | 5.5% | 3.2% |
| Hispanic | 20.6% | 32.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Crockett, CA | Oakley, CA | United States |
| Married Population | 43.1% | 56.2% | 49.8% |
| Currently Married | 42.0% | 54.9% | 48.0% |
| Married but Separated | 1.1% | 1.3% | 1.8% |
| Single Population | 56.9% | 43.8% | 50.2% |
| Never Married | 34.2% | 32.0% | 33.8% |
| Divorced | 16.2% | 7.9% | 10.8% |
| Widowed | 6.5% | 3.9% | 5.6% |
| space5 | | | |
| Household Size | 2.25 | 3.44 | 2.60 |
| Households | 1,516 | 12,480 | 124,010,992 |
| Family Households | 777 | 10,529 | 80,755,759 |
| Married couple, w/children | 33.5% | 40.9% | 30.5% |
| Married couple, no children | 45.0% | 37.9% | 42.9% |
| Non Family Households | 739 | 1,951 | 43,255,233 |
| Single householder, w/children | 8.9% | 14.2% | 15.8% |
| Single householder, no children | 12.6% | 7.0% | 10.8% |