| | Metaline Falls, WA | Kettle Falls, WA | United States |
| Population | 247 | 1,617 | 329,725,481 |
| Female Population | 47.8% | 49.5% | 50.5% |
| Male Population | 52.2% | 50.5% | 49.5% |
| Median Age | 56.7 | 44 | 38.4 |
| space3 | | | |
| Population - 2010 | 238 | 1,587 | 309,327,143 |
| Population - 2000 | 223 | 1,527 | 285,036,114 |
| Population - 1990 | 210 | 1,272 | 251,960,433 |
| Pop. 2000 to Now | 16.6% | 7.5% | 15.6% |
| Pop. 1990 to Now | 23.8% | 29.0% | 30.8% |
| space4 | | | |
| Population Density | 1,165.1 | 1,522.6 | 93.4 |
| Land Area | 0.2 | 1.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Metaline Falls, WA | Kettle Falls, WA | United States |
| Age 0 to 4 | 4.9% | 7.7% | 5.9% |
| Age 5 to 9 | 4.5% | 7.4% | 6.1% |
| Age 10 to 14 | 5.3% | 5.5% | 6.6% |
| Age 15 to 17 | 3.2% | 2.8% | 3.9% |
| Age 18 to 20 | 1.2% | 1.7% | 4.0% |
| Age 21 to 24 | 0.0% | 5.9% | 5.2% |
| Age 25 to 34 | 4.5% | 9.5% | 13.8% |
| Age 35 to 44 | 16.2% | 11.1% | 12.9% |
| Age 45 to 54 | 7.3% | 14.7% | 12.6% |
| Age 55 to 59 | 8.9% | 6.2% | 6.7% |
| Age 60 to 64 | 7.7% | 7.9% | 6.3% |
| Age 65 to 74 | 22.7% | 13.2% | 9.6% |
| Age 75 to 84 | 6.9% | 3.8% | 4.5% |
| Age 85 and over | 6.9% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Metaline Falls, WA | Kettle Falls, WA | United States |
| White | 94.7% | 85.3% | 59.4% |
| Black | 0.0% | 0.6% | 12.2% |
| Asian | 0.0% | 0.1% | 5.6% |
| Native American | 3.2% | 0.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 10.9% | 3.2% |
| Hispanic | 2.0% | 2.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Metaline Falls, WA | Kettle Falls, WA | United States |
| Married Population | 57.3% | 39.4% | 49.8% |
| Currently Married | 57.3% | 37.8% | 48.0% |
| Married but Separated | 0.0% | 1.6% | 1.8% |
| Single Population | 42.7% | 60.6% | 50.2% |
| Never Married | 17.1% | 27.4% | 33.8% |
| Divorced | 18.5% | 25.1% | 10.8% |
| Widowed | 7.1% | 8.1% | 5.6% |
| space5 | | | |
| Household Size | 1.80 | 2.17 | 2.60 |
| Households | 137 | 740 | 124,010,992 |
| Family Households | 59 | 372 | 80,755,759 |
| Married couple, w/children | 25.4% | 28.2% | 30.5% |
| Married couple, no children | 67.8% | 36.0% | 42.9% |
| Non Family Households | 78 | 368 | 43,255,233 |
| Single householder, w/children | 6.8% | 20.2% | 15.8% |
| Single householder, no children | 0.0% | 15.6% | 10.8% |