| | Lake Tapps, WA | Duvall, WA | United States |
| Population | 12,570 | 8,007 | 329,725,481 |
| Female Population | 47.9% | 52.7% | 50.5% |
| Male Population | 52.1% | 47.3% | 49.5% |
| Median Age | 41.9 | 37 | 38.4 |
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| Population - 2010 | 11,274 | 6,744 | 309,327,143 |
| Population - 2000 | 10,227 | 4,616 | 285,036,114 |
| Population - 1990 | 8,205 | 2,770 | 251,960,433 |
| Pop. 2000 to Now | 38.6% | 76.8% | 15.6% |
| Pop. 1990 to Now | 72.7% | 194.6% | 30.8% |
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| Population Density | 1,018.7 | 3,265.5 | 93.4 |
| Land Area | 12.3 | 2.5 | 3,531,905.4 |
| Water Area | 0.8 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Lake Tapps, WA | Duvall, WA | United States |
| Age 0 to 4 | 4.9% | 6.4% | 5.9% |
| Age 5 to 9 | 6.9% | 9.4% | 6.1% |
| Age 10 to 14 | 8.1% | 8.7% | 6.6% |
| Age 15 to 17 | 4.6% | 4.9% | 3.9% |
| Age 18 to 20 | 4.3% | 2.5% | 4.0% |
| Age 21 to 24 | 4.5% | 4.1% | 5.2% |
| Age 25 to 34 | 6.6% | 9.7% | 13.8% |
| Age 35 to 44 | 13.9% | 19.0% | 12.9% |
| Age 45 to 54 | 16.2% | 19.8% | 12.6% |
| Age 55 to 59 | 7.5% | 6.5% | 6.7% |
| Age 60 to 64 | 8.4% | 3.5% | 6.3% |
| Age 65 to 74 | 9.5% | 4.3% | 9.6% |
| Age 75 to 84 | 3.7% | 1.0% | 4.5% |
| Age 85 and over | 0.8% | 0.2% | 1.9% |
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| Race | | | |
| | Lake Tapps, WA | Duvall, WA | United States |
| White | 81.4% | 77.1% | 59.4% |
| Black | 0.4% | 0.6% | 12.2% |
| Asian | 2.8% | 8.8% | 5.6% |
| Native American | 0.5% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.6% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 7.3% | 2.1% | 3.2% |
| Hispanic | 6.7% | 11.4% | 18.4% |
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| Marriage & Family | | | |
| | Lake Tapps, WA | Duvall, WA | United States |
| Married Population | 62.2% | 67.0% | 49.8% |
| Currently Married | 62.1% | 64.4% | 48.0% |
| Married but Separated | 0.2% | 2.6% | 1.8% |
| Single Population | 37.8% | 33.0% | 50.2% |
| Never Married | 24.2% | 21.9% | 33.8% |
| Divorced | 10.5% | 7.8% | 10.8% |
| Widowed | 3.1% | 3.2% | 5.6% |
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| Household Size | 2.82 | 2.94 | 2.60 |
| Households | 4,462 | 2,722 | 124,010,992 |
| Family Households | 3,481 | 2,221 | 80,755,759 |
| Married couple, w/children | 37.8% | 51.7% | 30.5% |
| Married couple, no children | 49.6% | 34.1% | 42.9% |
| Non Family Households | 981 | 501 | 43,255,233 |
| Single householder, w/children | 7.7% | 7.0% | 15.8% |
| Single householder, no children | 4.9% | 7.2% | 10.8% |