| | Oso, WA | Stanwood, WA | United States |
| Population | 274 | 7,776 | 329,725,481 |
| Female Population | 51.5% | 52.6% | 50.5% |
| Male Population | 48.5% | 47.4% | 49.5% |
| Median Age | 38.6 | 31.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 195 | 6,269 | 309,327,143 |
| Population - 2000 | 246 | 3,923 | 285,036,114 |
| Population - 1990 | 109 | 1,961 | 251,960,433 |
| Pop. 2000 to Now | -6.9% | 93.0% | 15.6% |
| Pop. 1990 to Now | 110.1% | 286.1% | 30.8% |
| space4 | | | |
| Population Density | 97.7 | 2,660.3 | 93.4 |
| Land Area | 2.8 | 2.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Oso, WA | Stanwood, WA | United States |
| Age 0 to 4 | 0.0% | 7.4% | 5.9% |
| Age 5 to 9 | 15.3% | 9.9% | 6.1% |
| Age 10 to 14 | 15.7% | 10.9% | 6.6% |
| Age 15 to 17 | 14.2% | 5.7% | 3.9% |
| Age 18 to 20 | 0.0% | 1.8% | 4.0% |
| Age 21 to 24 | 0.0% | 5.4% | 5.2% |
| Age 25 to 34 | 0.0% | 14.4% | 13.8% |
| Age 35 to 44 | 29.6% | 12.3% | 12.9% |
| Age 45 to 54 | 0.0% | 12.8% | 12.6% |
| Age 55 to 59 | 0.0% | 4.0% | 6.7% |
| Age 60 to 64 | 6.2% | 5.3% | 6.3% |
| Age 65 to 74 | 19.0% | 4.8% | 9.6% |
| Age 75 to 84 | 0.0% | 2.4% | 4.5% |
| Age 85 and over | 0.0% | 3.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Oso, WA | Stanwood, WA | United States |
| White | 100.0% | 89.1% | 59.4% |
| Black | 0.0% | 0.1% | 12.2% |
| Asian | 0.0% | 2.1% | 5.6% |
| Native American | 0.0% | 0.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 6.2% | 3.2% |
| Hispanic | 0.0% | 1.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Oso, WA | Stanwood, WA | United States |
| Married Population | 79.4% | 54.6% | 49.8% |
| Currently Married | 79.4% | 54.3% | 48.0% |
| Married but Separated | 0.0% | 0.3% | 1.8% |
| Single Population | 20.6% | 45.4% | 50.2% |
| Never Married | 20.6% | 27.2% | 33.8% |
| Divorced | 0.0% | 9.9% | 10.8% |
| Widowed | 0.0% | 8.3% | 5.6% |
| space5 | | | |
| Household Size | 3.65 | 2.79 | 2.60 |
| Households | 75 | 2,738 | 124,010,992 |
| Family Households | 75 | 1,794 | 80,755,759 |
| Married couple, w/children | 53.3% | 45.8% | 30.5% |
| Married couple, no children | 46.7% | 35.8% | 42.9% |
| Non Family Households | 0 | 944 | 43,255,233 |
| Single householder, w/children | 0.0% | 12.4% | 15.8% |
| Single householder, no children | 0.0% | 6.0% | 10.8% |