| | Etna, CA | Willits, CA | United States |
| Population | 753 | 5,008 | 329,725,481 |
| Female Population | 51.4% | 54.1% | 50.5% |
| Male Population | 48.6% | 45.9% | 49.5% |
| Median Age | 41.6 | 41.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 739 | 4,922 | 309,327,143 |
| Population - 2000 | 781 | 5,073 | 285,036,114 |
| Population - 1990 | 835 | 5,027 | 251,960,433 |
| Pop. 2000 to Now | -9.6% | -4.8% | 15.6% |
| Pop. 1990 to Now | -15.5% | -3.9% | 30.8% |
| space4 | | | |
| Population Density | 990.8 | 1,777.8 | 93.4 |
| Land Area | 0.8 | 2.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Etna, CA | Willits, CA | United States |
| Age 0 to 4 | 11.7% | 4.5% | 5.9% |
| Age 5 to 9 | 2.3% | 5.6% | 6.1% |
| Age 10 to 14 | 8.1% | 7.4% | 6.6% |
| Age 15 to 17 | 2.8% | 1.7% | 3.9% |
| Age 18 to 20 | 3.2% | 3.4% | 4.0% |
| Age 21 to 24 | 0.7% | 5.0% | 5.2% |
| Age 25 to 34 | 12.5% | 12.8% | 13.8% |
| Age 35 to 44 | 15.3% | 12.7% | 12.9% |
| Age 45 to 54 | 14.9% | 9.2% | 12.6% |
| Age 55 to 59 | 0.0% | 3.8% | 6.7% |
| Age 60 to 64 | 5.7% | 3.8% | 6.3% |
| Age 65 to 74 | 16.6% | 16.7% | 9.6% |
| Age 75 to 84 | 5.4% | 9.5% | 4.5% |
| Age 85 and over | 0.9% | 4.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Etna, CA | Willits, CA | United States |
| White | 77.8% | 68.7% | 59.4% |
| Black | 4.1% | 1.0% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 4.1% | 1.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 8.0% | 4.1% | 3.2% |
| Hispanic | 6.0% | 24.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Etna, CA | Willits, CA | United States |
| Married Population | 43.1% | 32.1% | 49.8% |
| Currently Married | 40.5% | 29.1% | 48.0% |
| Married but Separated | 2.6% | 3.1% | 1.8% |
| Single Population | 56.9% | 67.9% | 50.2% |
| Never Married | 30.2% | 33.7% | 33.8% |
| Divorced | 23.3% | 22.2% | 10.8% |
| Widowed | 3.4% | 12.0% | 5.6% |
| space5 | | | |
| Household Size | 2.50 | 2.13 | 2.60 |
| Households | 295 | 2,311 | 124,010,992 |
| Family Households | 187 | 982 | 80,755,759 |
| Married couple, w/children | 27.8% | 22.4% | 30.5% |
| Married couple, no children | 34.8% | 29.6% | 42.9% |
| Non Family Households | 108 | 1,329 | 43,255,233 |
| Single householder, w/children | 20.9% | 28.3% | 15.8% |
| Single householder, no children | 16.6% | 19.7% | 10.8% |