| | Jamestown, CA | Salida, CA | United States |
| Population | 3,543 | 14,690 | 329,725,481 |
| Female Population | 51.8% | 47.9% | 50.5% |
| Male Population | 48.2% | 52.1% | 49.5% |
| Median Age | 41.8 | 31.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,684 | 14,625 | 309,327,143 |
| Population - 2000 | 3,017 | 12,560 | 285,036,114 |
| Population - 1990 | 2,178 | 4,499 | 251,960,433 |
| Pop. 2000 to Now | -11.7% | 18.5% | 15.6% |
| Pop. 1990 to Now | 22.3% | 230.9% | 30.8% |
| space4 | | | |
| Population Density | 1,180.6 | 2,776.9 | 93.4 |
| Land Area | 3.0 | 5.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Jamestown, CA | Salida, CA | United States |
| Age 0 to 4 | 6.2% | 6.4% | 5.9% |
| Age 5 to 9 | 3.4% | 6.3% | 6.1% |
| Age 10 to 14 | 4.5% | 7.4% | 6.6% |
| Age 15 to 17 | 5.4% | 3.1% | 3.9% |
| Age 18 to 20 | 1.3% | 6.8% | 4.0% |
| Age 21 to 24 | 4.7% | 5.4% | 5.2% |
| Age 25 to 34 | 9.9% | 20.0% | 13.8% |
| Age 35 to 44 | 19.5% | 12.0% | 12.9% |
| Age 45 to 54 | 9.9% | 11.1% | 12.6% |
| Age 55 to 59 | 6.8% | 6.6% | 6.7% |
| Age 60 to 64 | 4.4% | 4.5% | 6.3% |
| Age 65 to 74 | 12.1% | 6.8% | 9.6% |
| Age 75 to 84 | 6.5% | 3.1% | 4.5% |
| Age 85 and over | 5.4% | 0.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Jamestown, CA | Salida, CA | United States |
| White | 84.8% | 34.8% | 59.4% |
| Black | 0.0% | 1.3% | 12.2% |
| Asian | 0.0% | 9.1% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.9% | 0.1% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 1.6% | 3.2% |
| Hispanic | 13.4% | 53.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Jamestown, CA | Salida, CA | United States |
| Married Population | 41.3% | 51.3% | 49.8% |
| Currently Married | 39.2% | 51.1% | 48.0% |
| Married but Separated | 2.0% | 0.2% | 1.8% |
| Single Population | 58.7% | 48.7% | 50.2% |
| Never Married | 34.0% | 38.3% | 33.8% |
| Divorced | 11.7% | 7.4% | 10.8% |
| Widowed | 13.1% | 3.0% | 5.6% |
| space5 | | | |
| Household Size | 1.83 | 3.42 | 2.60 |
| Households | 1,932 | 4,278 | 124,010,992 |
| Family Households | 743 | 3,380 | 80,755,759 |
| Married couple, w/children | 30.7% | 36.2% | 30.5% |
| Married couple, no children | 52.6% | 40.8% | 42.9% |
| Non Family Households | 1,189 | 898 | 43,255,233 |
| Single householder, w/children | 14.8% | 13.9% | 15.8% |
| Single householder, no children | 1.9% | 9.1% | 10.8% |