| | Stilwell, OK | Selah, WA | United States |
| Population | 3,676 | 8,081 | 329,725,481 |
| Female Population | 53.1% | 53.6% | 50.5% |
| Male Population | 46.9% | 46.4% | 49.5% |
| Median Age | 32.2 | 32.9 | 38.4 |
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| Population - 2010 | 3,976 | 7,359 | 309,327,143 |
| Population - 2000 | 3,276 | 6,310 | 285,036,114 |
| Population - 1990 | 2,663 | 5,113 | 251,960,433 |
| Pop. 2000 to Now | 22.4% | 29.0% | 15.6% |
| Pop. 1990 to Now | 50.6% | 59.2% | 30.8% |
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| Population Density | 1,133.9 | 1,763.6 | 93.4 |
| Land Area | 3.2 | 4.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Stilwell, OK | Selah, WA | United States |
| Age 0 to 4 | 10.4% | 7.7% | 5.9% |
| Age 5 to 9 | 6.3% | 7.9% | 6.1% |
| Age 10 to 14 | 8.1% | 6.9% | 6.6% |
| Age 15 to 17 | 5.6% | 4.2% | 3.9% |
| Age 18 to 20 | 3.9% | 5.5% | 4.0% |
| Age 21 to 24 | 6.4% | 4.7% | 5.2% |
| Age 25 to 34 | 13.7% | 15.8% | 13.8% |
| Age 35 to 44 | 11.2% | 12.1% | 12.9% |
| Age 45 to 54 | 9.6% | 11.6% | 12.6% |
| Age 55 to 59 | 6.1% | 6.3% | 6.7% |
| Age 60 to 64 | 5.7% | 5.8% | 6.3% |
| Age 65 to 74 | 5.9% | 6.8% | 9.6% |
| Age 75 to 84 | 4.7% | 3.1% | 4.5% |
| Age 85 and over | 2.3% | 1.7% | 1.9% |
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| Race | | | |
| | Stilwell, OK | Selah, WA | United States |
| White | 27.9% | 63.8% | 59.4% |
| Black | 0.9% | 1.6% | 12.2% |
| Asian | 0.1% | 1.4% | 5.6% |
| Native American | 47.3% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 13.8% | 7.1% | 3.2% |
| Hispanic | 10.1% | 25.5% | 18.4% |
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| Marriage & Family | | | |
| | Stilwell, OK | Selah, WA | United States |
| Married Population | 42.7% | 53.9% | 49.8% |
| Currently Married | 36.8% | 53.4% | 48.0% |
| Married but Separated | 5.9% | 0.5% | 1.8% |
| Single Population | 57.4% | 46.1% | 50.2% |
| Never Married | 31.9% | 26.7% | 33.8% |
| Divorced | 15.4% | 15.3% | 10.8% |
| Widowed | 10.0% | 4.0% | 5.6% |
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| Household Size | 2.60 | 2.46 | 2.60 |
| Households | 1,371 | 3,222 | 124,010,992 |
| Family Households | 886 | 2,133 | 80,755,759 |
| Married couple, w/children | 26.3% | 31.9% | 30.5% |
| Married couple, no children | 23.9% | 44.8% | 42.9% |
| Non Family Households | 485 | 1,089 | 43,255,233 |
| Single householder, w/children | 41.9% | 16.3% | 15.8% |
| Single householder, no children | 7.9% | 7.0% | 10.8% |