| | Spangle, WA | Millwood, WA | United States |
| Population | 265 | 1,896 | 329,725,481 |
| Female Population | 43.8% | 51.6% | 50.5% |
| Male Population | 56.2% | 48.4% | 49.5% |
| Median Age | 39.1 | 37.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 278 | 1,786 | 309,327,143 |
| Population - 2000 | 240 | 1,649 | 285,036,114 |
| Population - 1990 | 229 | 1,559 | 251,960,433 |
| Pop. 2000 to Now | 35.4% | 9.2% | 15.6% |
| Pop. 1990 to Now | 41.9% | 15.5% | 30.8% |
| space4 | | | |
| Population Density | 759.3 | 2,724.1 | 93.4 |
| Land Area | 0.3 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Spangle, WA | Millwood, WA | United States |
| Age 0 to 4 | 6.8% | 7.4% | 5.9% |
| Age 5 to 9 | 4.9% | 6.7% | 6.1% |
| Age 10 to 14 | 0.0% | 6.2% | 6.6% |
| Age 15 to 17 | 7.2% | 4.0% | 3.9% |
| Age 18 to 20 | 4.5% | 3.1% | 4.0% |
| Age 21 to 24 | 5.7% | 4.7% | 5.2% |
| Age 25 to 34 | 19.2% | 13.8% | 13.8% |
| Age 35 to 44 | 16.2% | 12.9% | 12.9% |
| Age 45 to 54 | 12.8% | 11.3% | 12.6% |
| Age 55 to 59 | 6.4% | 7.8% | 6.7% |
| Age 60 to 64 | 1.9% | 7.5% | 6.3% |
| Age 65 to 74 | 9.1% | 10.1% | 9.6% |
| Age 75 to 84 | 2.6% | 2.8% | 4.5% |
| Age 85 and over | 2.6% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Spangle, WA | Millwood, WA | United States |
| White | 90.9% | 87.4% | 59.4% |
| Black | 0.0% | 0.8% | 12.2% |
| Asian | 0.0% | 1.0% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 6.8% | 0.0% | 0.4% |
| Two or More Races | 1.5% | 6.6% | 3.2% |
| Hispanic | 0.8% | 3.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Spangle, WA | Millwood, WA | United States |
| Married Population | 53.0% | 43.5% | 49.8% |
| Currently Married | 51.3% | 42.3% | 48.0% |
| Married but Separated | 1.7% | 1.3% | 1.8% |
| Single Population | 47.0% | 56.5% | 50.2% |
| Never Married | 33.3% | 36.3% | 33.8% |
| Divorced | 9.8% | 15.0% | 10.8% |
| Widowed | 3.8% | 5.2% | 5.6% |
| space5 | | | |
| Household Size | 2.25 | 2.46 | 2.60 |
| Households | 118 | 768 | 124,010,992 |
| Family Households | 58 | 450 | 80,755,759 |
| Married couple, w/children | 62.1% | 25.6% | 30.5% |
| Married couple, no children | 25.9% | 42.0% | 42.9% |
| Non Family Households | 60 | 318 | 43,255,233 |
| Single householder, w/children | 0.0% | 23.6% | 15.8% |
| Single householder, no children | 12.1% | 8.9% | 10.8% |