| | Clayton, WA | Colville, WA | United States |
| Population | 292 | 4,871 | 329,725,481 |
| Female Population | 82.9% | 56.3% | 50.5% |
| Male Population | 17.1% | 43.7% | 49.5% |
| Median Age | 36.3 | 42.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 583 | 4,711 | 309,327,143 |
| Population - 2000 | 278 | 4,988 | 285,036,114 |
| Population - 1990 | 197 | 4,360 | 251,960,433 |
| Pop. 2000 to Now | 38.1% | -3.2% | 15.6% |
| Pop. 1990 to Now | 94.9% | 10.7% | 30.8% |
| space4 | | | |
| Population Density | 226.4 | 1,579.4 | 93.4 |
| Land Area | 1.3 | 3.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Clayton, WA | Colville, WA | United States |
| Age 0 to 4 | 0.0% | 5.4% | 5.9% |
| Age 5 to 9 | 8.9% | 7.3% | 6.1% |
| Age 10 to 14 | 16.1% | 4.4% | 6.6% |
| Age 15 to 17 | 3.1% | 4.9% | 3.9% |
| Age 18 to 20 | 0.0% | 2.4% | 4.0% |
| Age 21 to 24 | 0.0% | 3.6% | 5.2% |
| Age 25 to 34 | 12.7% | 15.4% | 13.8% |
| Age 35 to 44 | 25.0% | 9.7% | 12.9% |
| Age 45 to 54 | 11.0% | 11.5% | 12.6% |
| Age 55 to 59 | 0.0% | 5.1% | 6.7% |
| Age 60 to 64 | 6.2% | 5.3% | 6.3% |
| Age 65 to 74 | 17.1% | 14.2% | 9.6% |
| Age 75 to 84 | 0.0% | 6.1% | 4.5% |
| Age 85 and over | 0.0% | 4.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Clayton, WA | Colville, WA | United States |
| White | 89.7% | 81.5% | 59.4% |
| Black | 0.0% | 0.1% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 10.3% | 2.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.0% | 7.1% | 3.2% |
| Hispanic | 0.0% | 8.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Clayton, WA | Colville, WA | United States |
| Married Population | 56.6% | 49.5% | 49.8% |
| Currently Married | 42.0% | 48.0% | 48.0% |
| Married but Separated | 14.6% | 1.5% | 1.8% |
| Single Population | 43.4% | 50.5% | 50.2% |
| Never Married | 4.1% | 28.3% | 33.8% |
| Divorced | 39.3% | 12.1% | 10.8% |
| Widowed | 0.0% | 10.1% | 5.6% |
| space5 | | | |
| Household Size | 2.65 | 2.27 | 2.60 |
| Households | 110 | 2,074 | 124,010,992 |
| Family Households | 78 | 1,177 | 80,755,759 |
| Married couple, w/children | 35.9% | 30.4% | 30.5% |
| Married couple, no children | 16.7% | 48.5% | 42.9% |
| Non Family Households | 32 | 897 | 43,255,233 |
| Single householder, w/children | 0.0% | 11.0% | 15.8% |
| Single householder, no children | 47.4% | 10.0% | 10.8% |