| | Roslyn, WA | Snohomish, WA | United States |
| Population | 703 | 10,091 | 329,725,481 |
| Female Population | 43.8% | 52.3% | 50.5% |
| Male Population | 56.2% | 47.7% | 49.5% |
| Median Age | 43.1 | 39.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 890 | 9,179 | 309,327,143 |
| Population - 2000 | 1,017 | 8,494 | 285,036,114 |
| Population - 1990 | 869 | 6,499 | 251,960,433 |
| Pop. 2000 to Now | -4.4% | 22.0% | 15.6% |
| Pop. 1990 to Now | 11.9% | 59.4% | 30.8% |
| space4 | | | |
| Population Density | 163.0 | 2,900.6 | 93.4 |
| Land Area | 4.3 | 3.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Roslyn, WA | Snohomish, WA | United States |
| Age 0 to 4 | 4.0% | 5.8% | 5.9% |
| Age 5 to 9 | 1.3% | 6.0% | 6.1% |
| Age 10 to 14 | 4.8% | 6.5% | 6.6% |
| Age 15 to 17 | 3.7% | 3.4% | 3.9% |
| Age 18 to 20 | 1.3% | 4.1% | 4.0% |
| Age 21 to 24 | 3.6% | 2.7% | 5.2% |
| Age 25 to 34 | 19.5% | 14.3% | 13.8% |
| Age 35 to 44 | 20.8% | 13.3% | 12.9% |
| Age 45 to 54 | 12.9% | 15.1% | 12.6% |
| Age 55 to 59 | 9.8% | 4.3% | 6.7% |
| Age 60 to 64 | 5.4% | 6.4% | 6.3% |
| Age 65 to 74 | 10.1% | 10.5% | 9.6% |
| Age 75 to 84 | 2.8% | 5.8% | 4.5% |
| Age 85 and over | 0.0% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Roslyn, WA | Snohomish, WA | United States |
| White | 84.6% | 84.0% | 59.4% |
| Black | 0.0% | 0.2% | 12.2% |
| Asian | 4.0% | 2.8% | 5.6% |
| Native American | 1.8% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.4% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 1.8% | 6.5% | 3.2% |
| Hispanic | 7.7% | 5.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Roslyn, WA | Snohomish, WA | United States |
| Married Population | 48.4% | 47.3% | 49.8% |
| Currently Married | 48.4% | 44.8% | 48.0% |
| Married but Separated | 0.0% | 2.6% | 1.8% |
| Single Population | 51.6% | 52.7% | 50.2% |
| Never Married | 35.1% | 27.6% | 33.8% |
| Divorced | 11.9% | 18.8% | 10.8% |
| Widowed | 4.6% | 6.3% | 5.6% |
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| Household Size | 2.12 | 2.35 | 2.60 |
| Households | 332 | 4,190 | 124,010,992 |
| Family Households | 163 | 2,560 | 80,755,759 |
| Married couple, w/children | 31.3% | 30.5% | 30.5% |
| Married couple, no children | 60.1% | 38.0% | 42.9% |
| Non Family Households | 169 | 1,630 | 43,255,233 |
| Single householder, w/children | 4.9% | 20.7% | 15.8% |
| Single householder, no children | 3.7% | 10.7% | 10.8% |