| | Waitsburg, WA | Mattawa, WA | United States |
| Population | 999 | 3,529 | 329,725,481 |
| Female Population | 48.8% | 49.0% | 50.5% |
| Male Population | 51.3% | 51.0% | 49.5% |
| Median Age | 41.3 | 23.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,217 | 4,463 | 309,327,143 |
| Population - 2000 | 1,212 | 2,609 | 285,036,114 |
| Population - 1990 | 990 | 941 | 251,960,433 |
| Pop. 2000 to Now | 3.5% | 95.9% | 15.6% |
| Pop. 1990 to Now | 26.7% | 443.3% | 30.8% |
| space4 | | | |
| Population Density | 841.6 | 4,788.3 | 93.4 |
| Land Area | 1.2 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Waitsburg, WA | Mattawa, WA | United States |
| Age 0 to 4 | 3.0% | 8.3% | 5.9% |
| Age 5 to 9 | 6.7% | 11.3% | 6.1% |
| Age 10 to 14 | 8.6% | 9.8% | 6.6% |
| Age 15 to 17 | 3.0% | 7.1% | 3.9% |
| Age 18 to 20 | 1.2% | 9.1% | 4.0% |
| Age 21 to 24 | 9.2% | 9.1% | 5.2% |
| Age 25 to 34 | 11.1% | 12.9% | 13.8% |
| Age 35 to 44 | 11.5% | 11.1% | 12.9% |
| Age 45 to 54 | 9.0% | 10.6% | 12.6% |
| Age 55 to 59 | 7.2% | 3.8% | 6.7% |
| Age 60 to 64 | 6.8% | 3.5% | 6.3% |
| Age 65 to 74 | 14.9% | 1.9% | 9.6% |
| Age 75 to 84 | 5.5% | 1.6% | 4.5% |
| Age 85 and over | 2.2% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Waitsburg, WA | Mattawa, WA | United States |
| White | 85.0% | 0.5% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.8% | 0.0% | 5.6% |
| Native American | 1.5% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.4% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.0% | 0.0% | 3.2% |
| Hispanic | 8.3% | 99.5% | 18.4% |
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| Marriage & Family | | | |
| | Waitsburg, WA | Mattawa, WA | United States |
| Married Population | 52.5% | 38.1% | 49.8% |
| Currently Married | 51.7% | 34.5% | 48.0% |
| Married but Separated | 0.7% | 3.5% | 1.8% |
| Single Population | 47.5% | 61.9% | 50.2% |
| Never Married | 22.3% | 53.9% | 33.8% |
| Divorced | 16.9% | 5.1% | 10.8% |
| Widowed | 8.3% | 3.0% | 5.6% |
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| Household Size | 2.37 | 4.14 | 2.60 |
| Households | 421 | 852 | 124,010,992 |
| Family Households | 284 | 771 | 80,755,759 |
| Married couple, w/children | 37.3% | 37.2% | 30.5% |
| Married couple, no children | 37.7% | 11.5% | 42.9% |
| Non Family Households | 137 | 81 | 43,255,233 |
| Single householder, w/children | 16.9% | 47.6% | 15.8% |
| Single householder, no children | 8.1% | 3.6% | 10.8% |