| | Hamilton Branch, CA | East Quincy, CA | United States |
| Population | 390 | 2,276 | 329,725,481 |
| Female Population | 45.9% | 47.8% | 50.5% |
| Male Population | 54.1% | 52.2% | 49.5% |
| Median Age | 60.3 | 43.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 532 | 2,706 | 309,327,143 |
| Population - 2000 | 587 | 2,398 | 285,036,114 |
| Population - 1990 | 448 | 2,469 | 251,960,433 |
| Pop. 2000 to Now | 9.9% | 7.0% | 15.6% |
| Pop. 1990 to Now | 44.0% | 3.9% | 30.8% |
| space4 | | | |
| Population Density | 359.5 | 187.9 | 93.4 |
| Land Area | 1.1 | 12.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hamilton Branch, CA | East Quincy, CA | United States |
| Age 0 to 4 | 2.1% | 0.0% | 5.9% |
| Age 5 to 9 | 6.9% | 3.2% | 6.1% |
| Age 10 to 14 | 5.4% | 5.9% | 6.6% |
| Age 15 to 17 | 0.0% | 6.1% | 3.9% |
| Age 18 to 20 | 0.0% | 0.7% | 4.0% |
| Age 21 to 24 | 0.0% | 9.9% | 5.2% |
| Age 25 to 34 | 7.9% | 15.9% | 13.8% |
| Age 35 to 44 | 9.5% | 11.0% | 12.9% |
| Age 45 to 54 | 4.1% | 13.7% | 12.6% |
| Age 55 to 59 | 12.8% | 10.2% | 6.7% |
| Age 60 to 64 | 14.9% | 8.9% | 6.3% |
| Age 65 to 74 | 17.4% | 8.4% | 9.6% |
| Age 75 to 84 | 17.4% | 4.8% | 4.5% |
| Age 85 and over | 1.5% | 1.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hamilton Branch, CA | East Quincy, CA | United States |
| White | 85.6% | 82.2% | 59.4% |
| Black | 0.0% | 3.9% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 1.3% | 1.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 7.7% | 5.4% | 3.2% |
| Hispanic | 5.4% | 7.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hamilton Branch, CA | East Quincy, CA | United States |
| Married Population | 75.7% | 48.5% | 49.8% |
| Currently Married | 74.9% | 44.8% | 48.0% |
| Married but Separated | 0.9% | 3.7% | 1.8% |
| Single Population | 24.3% | 51.5% | 50.2% |
| Never Married | 12.6% | 32.5% | 33.8% |
| Divorced | 11.7% | 16.3% | 10.8% |
| Widowed | 0.0% | 2.7% | 5.6% |
| space5 | | | |
| Household Size | 2.04 | 2.62 | 2.60 |
| Households | 191 | 850 | 124,010,992 |
| Family Households | 134 | 574 | 80,755,759 |
| Married couple, w/children | 19.4% | 20.2% | 30.5% |
| Married couple, no children | 70.1% | 54.4% | 42.9% |
| Non Family Households | 57 | 276 | 43,255,233 |
| Single householder, w/children | 6.0% | 9.4% | 15.8% |
| Single householder, no children | 4.5% | 16.0% | 10.8% |