| | Maltby, WA | Fall City, WA | United States |
| Population | 11,458 | 2,187 | 329,725,481 |
| Female Population | 47.6% | 45.5% | 50.5% |
| Male Population | 52.4% | 54.5% | 49.5% |
| Median Age | 45.4 | 36.6 | 38.4 |
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| Population - 2010 | 11,664 | 2,068 | 309,327,143 |
| Population - 2000 | 8,267 | 1,638 | 285,036,114 |
| Population - 1990 | 9,125 | 1,582 | 251,960,433 |
| Pop. 2000 to Now | 49.3% | 24.2% | 15.6% |
| Pop. 1990 to Now | 35.2% | 28.6% | 30.8% |
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| Population Density | 593.2 | 770.9 | 93.4 |
| Land Area | 19.3 | 2.8 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Maltby, WA | Fall City, WA | United States |
| Age 0 to 4 | 5.0% | 11.2% | 5.9% |
| Age 5 to 9 | 4.9% | 4.4% | 6.1% |
| Age 10 to 14 | 7.2% | 5.5% | 6.6% |
| Age 15 to 17 | 4.7% | 2.3% | 3.9% |
| Age 18 to 20 | 2.5% | 3.2% | 4.0% |
| Age 21 to 24 | 2.7% | 7.0% | 5.2% |
| Age 25 to 34 | 10.1% | 9.5% | 13.8% |
| Age 35 to 44 | 12.0% | 14.5% | 12.9% |
| Age 45 to 54 | 16.2% | 12.1% | 12.6% |
| Age 55 to 59 | 9.3% | 9.7% | 6.7% |
| Age 60 to 64 | 10.0% | 3.4% | 6.3% |
| Age 65 to 74 | 10.7% | 11.4% | 9.6% |
| Age 75 to 84 | 2.6% | 2.2% | 4.5% |
| Age 85 and over | 2.0% | 3.5% | 1.9% |
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| Race | | | |
| | Maltby, WA | Fall City, WA | United States |
| White | 84.5% | 74.9% | 59.4% |
| Black | 1.4% | 0.0% | 12.2% |
| Asian | 3.5% | 5.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 1.1% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 5.1% | 10.8% | 3.2% |
| Hispanic | 5.4% | 8.2% | 18.4% |
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| Marriage & Family | | | |
| | Maltby, WA | Fall City, WA | United States |
| Married Population | 65.2% | 63.3% | 49.8% |
| Currently Married | 64.8% | 62.8% | 48.0% |
| Married but Separated | 0.4% | 0.5% | 1.8% |
| Single Population | 34.8% | 36.7% | 50.2% |
| Never Married | 22.1% | 23.8% | 33.8% |
| Divorced | 9.0% | 5.3% | 10.8% |
| Widowed | 3.7% | 7.5% | 5.6% |
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| Household Size | 2.91 | 3.18 | 2.60 |
| Households | 3,916 | 687 | 124,010,992 |
| Family Households | 3,156 | 611 | 80,755,759 |
| Married couple, w/children | 35.6% | 33.2% | 30.5% |
| Married couple, no children | 55.3% | 47.1% | 42.9% |
| Non Family Households | 760 | 76 | 43,255,233 |
| Single householder, w/children | 3.5% | 10.8% | 15.8% |
| Single householder, no children | 5.6% | 8.8% | 10.8% |