| | Index, WA | Alderwood Manor, WA | United States |
| Population | 156 | 10,359 | 329,725,481 |
| Female Population | 50.6% | 50.2% | 50.5% |
| Male Population | 49.4% | 49.8% | 49.5% |
| Median Age | 49.5 | 36.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 176 | 7,898 | 309,327,143 |
| Population - 2000 | 157 | 15,329 | 285,036,114 |
| Population - 1990 | 139 | 7,065 | 251,960,433 |
| Pop. 2000 to Now | 36.3% | -38.0% | 15.6% |
| Pop. 1990 to Now | 54.0% | 34.6% | 30.8% |
| space4 | | | |
| Population Density | 757.3 | 5,208.1 | 93.4 |
| Land Area | 0.2 | 2.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Index, WA | Alderwood Manor, WA | United States |
| Age 0 to 4 | 0.0% | 6.5% | 5.9% |
| Age 5 to 9 | 3.8% | 4.6% | 6.1% |
| Age 10 to 14 | 7.1% | 6.0% | 6.6% |
| Age 15 to 17 | 2.6% | 3.3% | 3.9% |
| Age 18 to 20 | 0.0% | 3.4% | 4.0% |
| Age 21 to 24 | 3.2% | 7.9% | 5.2% |
| Age 25 to 34 | 6.4% | 14.0% | 13.8% |
| Age 35 to 44 | 13.5% | 11.9% | 12.9% |
| Age 45 to 54 | 19.2% | 20.2% | 12.6% |
| Age 55 to 59 | 11.5% | 5.4% | 6.7% |
| Age 60 to 64 | 11.5% | 6.8% | 6.3% |
| Age 65 to 74 | 10.3% | 5.3% | 9.6% |
| Age 75 to 84 | 8.3% | 3.2% | 4.5% |
| Age 85 and over | 2.6% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Index, WA | Alderwood Manor, WA | United States |
| White | 96.2% | 59.5% | 59.4% |
| Black | 0.0% | 5.5% | 12.2% |
| Asian | 3.8% | 18.7% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 0.0% | 3.9% | 3.2% |
| Hispanic | 0.0% | 12.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Index, WA | Alderwood Manor, WA | United States |
| Married Population | 47.5% | 49.8% | 49.8% |
| Currently Married | 47.5% | 49.3% | 48.0% |
| Married but Separated | 0.0% | 0.5% | 1.8% |
| Single Population | 52.5% | 50.2% | 50.2% |
| Never Married | 23.7% | 37.5% | 33.8% |
| Divorced | 22.3% | 8.8% | 10.8% |
| Widowed | 6.5% | 3.8% | 5.6% |
| space5 | | | |
| Household Size | 2.20 | 3.08 | 2.60 |
| Households | 71 | 3,345 | 124,010,992 |
| Family Households | 38 | 2,500 | 80,755,759 |
| Married couple, w/children | 31.6% | 32.5% | 30.5% |
| Married couple, no children | 44.7% | 40.0% | 42.9% |
| Non Family Households | 33 | 845 | 43,255,233 |
| Single householder, w/children | 0.0% | 7.4% | 15.8% |
| Single householder, no children | 23.7% | 20.1% | 10.8% |