| | DuPont, WA | Brookings, OR | United States |
| Population | 9,974 | 6,706 | 329,725,481 |
| Female Population | 51.6% | 48.9% | 50.5% |
| Male Population | 48.4% | 51.2% | 49.5% |
| Median Age | 34.1 | 54.5 | 38.4 |
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| Population - 2010 | 8,257 | 6,343 | 309,327,143 |
| Population - 2000 | 2,452 | 5,447 | 285,036,114 |
| Population - 1990 | 592 | 4,400 | 251,960,433 |
| Pop. 2000 to Now | 291.3% | 20.5% | 15.6% |
| Pop. 1990 to Now | 1,520.6% | 49.1% | 30.8% |
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| Population Density | 1,715.2 | 1,617.5 | 93.4 |
| Land Area | 5.8 | 4.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | DuPont, WA | Brookings, OR | United States |
| Age 0 to 4 | 5.7% | 4.3% | 5.9% |
| Age 5 to 9 | 8.8% | 3.5% | 6.1% |
| Age 10 to 14 | 8.7% | 1.6% | 6.6% |
| Age 15 to 17 | 3.4% | 2.8% | 3.9% |
| Age 18 to 20 | 3.4% | 1.3% | 4.0% |
| Age 21 to 24 | 3.6% | 3.9% | 5.2% |
| Age 25 to 34 | 17.6% | 16.0% | 13.8% |
| Age 35 to 44 | 15.9% | 6.8% | 12.9% |
| Age 45 to 54 | 13.8% | 10.6% | 12.6% |
| Age 55 to 59 | 4.3% | 9.1% | 6.7% |
| Age 60 to 64 | 6.4% | 13.2% | 6.3% |
| Age 65 to 74 | 3.8% | 15.1% | 9.6% |
| Age 75 to 84 | 3.4% | 6.2% | 4.5% |
| Age 85 and over | 1.3% | 5.7% | 1.9% |
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| Race | | | |
| | DuPont, WA | Brookings, OR | United States |
| White | 60.0% | 83.8% | 59.4% |
| Black | 6.4% | 0.3% | 12.2% |
| Asian | 8.8% | 1.6% | 5.6% |
| Native American | 0.9% | 1.4% | 0.6% |
| Hawaiian, Pacific Islander | 1.1% | 0.0% | 0.2% |
| Other | 0.5% | 0.0% | 0.4% |
| Two or More Races | 6.0% | 4.7% | 3.2% |
| Hispanic | 16.3% | 8.2% | 18.4% |
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| Marriage & Family | | | |
| | DuPont, WA | Brookings, OR | United States |
| Married Population | 67.2% | 57.7% | 49.8% |
| Currently Married | 66.5% | 57.2% | 48.0% |
| Married but Separated | 0.7% | 0.5% | 1.8% |
| Single Population | 32.8% | 42.3% | 50.2% |
| Never Married | 23.0% | 20.6% | 33.8% |
| Divorced | 7.3% | 17.1% | 10.8% |
| Widowed | 2.5% | 4.6% | 5.6% |
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| Household Size | 2.43 | 2.11 | 2.60 |
| Households | 4,108 | 3,112 | 124,010,992 |
| Family Households | 2,731 | 2,122 | 80,755,759 |
| Married couple, w/children | 43.9% | 18.5% | 30.5% |
| Married couple, no children | 44.9% | 59.3% | 42.9% |
| Non Family Households | 1,377 | 990 | 43,255,233 |
| Single householder, w/children | 8.7% | 13.1% | 15.8% |
| Single householder, no children | 2.6% | 9.0% | 10.8% |