| | Spanaway, WA | Sequim, WA | United States |
| Population | 34,670 | 7,896 | 329,725,481 |
| Female Population | 49.2% | 53.4% | 50.5% |
| Male Population | 50.9% | 46.6% | 49.5% |
| Median Age | 31.7 | 55.7 | 38.4 |
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| Population - 2010 | 28,054 | 6,583 | 309,327,143 |
| Population - 2000 | 21,588 | 4,334 | 285,036,114 |
| Population - 1990 | 15,001 | 3,616 | 251,960,433 |
| Pop. 2000 to Now | 53.1% | 79.5% | 15.6% |
| Pop. 1990 to Now | 120.3% | 115.2% | 30.8% |
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| Population Density | 3,954.6 | 1,243.7 | 93.4 |
| Land Area | 8.8 | 6.3 | 3,531,905.4 |
| Water Area | 0.4 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Spanaway, WA | Sequim, WA | United States |
| Age 0 to 4 | 6.7% | 4.6% | 5.9% |
| Age 5 to 9 | 8.5% | 6.4% | 6.1% |
| Age 10 to 14 | 8.1% | 4.9% | 6.6% |
| Age 15 to 17 | 5.7% | 1.8% | 3.9% |
| Age 18 to 20 | 3.5% | 2.9% | 4.0% |
| Age 21 to 24 | 4.9% | 5.0% | 5.2% |
| Age 25 to 34 | 17.5% | 9.3% | 13.8% |
| Age 35 to 44 | 13.6% | 7.2% | 12.9% |
| Age 45 to 54 | 11.3% | 7.3% | 12.6% |
| Age 55 to 59 | 6.7% | 6.4% | 6.7% |
| Age 60 to 64 | 4.0% | 8.4% | 6.3% |
| Age 65 to 74 | 6.2% | 16.3% | 9.6% |
| Age 75 to 84 | 2.6% | 12.4% | 4.5% |
| Age 85 and over | 0.7% | 7.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Spanaway, WA | Sequim, WA | United States |
| White | 52.2% | 80.7% | 59.4% |
| Black | 9.3% | 3.2% | 12.2% |
| Asian | 6.6% | 3.9% | 5.6% |
| Native American | 0.9% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 5.3% | 0.1% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 11.0% | 5.0% | 3.2% |
| Hispanic | 14.4% | 6.8% | 18.4% |
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| Marriage & Family | | | |
| | Spanaway, WA | Sequim, WA | United States |
| Married Population | 51.3% | 43.6% | 49.8% |
| Currently Married | 49.4% | 43.5% | 48.0% |
| Married but Separated | 1.8% | 0.1% | 1.8% |
| Single Population | 48.7% | 56.4% | 50.2% |
| Never Married | 32.4% | 27.0% | 33.8% |
| Divorced | 13.6% | 17.0% | 10.8% |
| Widowed | 2.7% | 12.4% | 5.6% |
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| Household Size | 3.06 | 1.99 | 2.60 |
| Households | 11,304 | 3,821 | 124,010,992 |
| Family Households | 8,466 | 1,922 | 80,755,759 |
| Married couple, w/children | 33.8% | 12.3% | 30.5% |
| Married couple, no children | 34.8% | 53.2% | 42.9% |
| Non Family Households | 2,838 | 1,899 | 43,255,233 |
| Single householder, w/children | 20.4% | 23.4% | 15.8% |
| Single householder, no children | 11.0% | 11.1% | 10.8% |