| | Oroville, WA | Hamilton, MT | United States |
| Population | 1,694 | 4,632 | 329,725,481 |
| Female Population | 51.2% | 56.1% | 50.5% |
| Male Population | 48.8% | 43.9% | 49.5% |
| Median Age | 40.1 | 48.5 | 38.4 |
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| Population - 2010 | 1,711 | 4,288 | 309,327,143 |
| Population - 2000 | 1,653 | 3,705 | 285,036,114 |
| Population - 1990 | 1,505 | 2,737 | 251,960,433 |
| Pop. 2000 to Now | 2.1% | 36.5% | 15.6% |
| Pop. 1990 to Now | 12.2% | 84.7% | 30.8% |
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| Population Density | 1,003.0 | 1,910.9 | 93.4 |
| Land Area | 1.7 | 2.4 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Oroville, WA | Hamilton, MT | United States |
| Age 0 to 4 | 9.4% | 6.7% | 5.9% |
| Age 5 to 9 | 8.0% | 2.4% | 6.1% |
| Age 10 to 14 | 6.2% | 2.2% | 6.6% |
| Age 15 to 17 | 3.9% | 2.3% | 3.9% |
| Age 18 to 20 | 2.7% | 1.6% | 4.0% |
| Age 21 to 24 | 3.6% | 4.9% | 5.2% |
| Age 25 to 34 | 12.1% | 10.0% | 13.8% |
| Age 35 to 44 | 6.8% | 16.0% | 12.9% |
| Age 45 to 54 | 15.8% | 11.1% | 12.6% |
| Age 55 to 59 | 6.3% | 5.9% | 6.7% |
| Age 60 to 64 | 7.3% | 6.6% | 6.3% |
| Age 65 to 74 | 11.0% | 14.1% | 9.6% |
| Age 75 to 84 | 6.2% | 8.8% | 4.5% |
| Age 85 and over | 0.6% | 7.6% | 1.9% |
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| Race | | | |
| | Oroville, WA | Hamilton, MT | United States |
| White | 48.2% | 91.3% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.2% | 0.8% | 5.6% |
| Native American | 1.5% | 1.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 9.7% | 2.1% | 3.2% |
| Hispanic | 40.1% | 4.0% | 18.4% |
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| Marriage & Family | | | |
| | Oroville, WA | Hamilton, MT | United States |
| Married Population | 44.1% | 40.5% | 49.8% |
| Currently Married | 41.4% | 39.7% | 48.0% |
| Married but Separated | 2.7% | 0.8% | 1.8% |
| Single Population | 55.9% | 59.5% | 50.2% |
| Never Married | 28.6% | 23.6% | 33.8% |
| Divorced | 16.3% | 21.3% | 10.8% |
| Widowed | 11.0% | 14.6% | 5.6% |
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| Household Size | 2.43 | 1.68 | 2.60 |
| Households | 696 | 2,652 | 124,010,992 |
| Family Households | 367 | 1,155 | 80,755,759 |
| Married couple, w/children | 32.2% | 22.2% | 30.5% |
| Married couple, no children | 36.0% | 48.4% | 42.9% |
| Non Family Households | 329 | 1,497 | 43,255,233 |
| Single householder, w/children | 18.8% | 15.5% | 15.8% |
| Single householder, no children | 13.1% | 13.9% | 10.8% |