| | Brinnon, WA | Pendleton, OR | United States |
| Population | 881 | 16,861 | 329,725,481 |
| Female Population | 45.4% | 45.6% | 50.5% |
| Male Population | 54.6% | 54.4% | 49.5% |
| Median Age | 63.8 | 36.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 731 | 16,656 | 309,327,143 |
| Population - 2000 | 803 | 16,354 | 285,036,114 |
| Population - 1990 | 669 | 15,126 | 251,960,433 |
| Pop. 2000 to Now | -5.7% | 1.5% | 15.6% |
| Pop. 1990 to Now | 13.2% | 9.7% | 30.8% |
| space4 | | | |
| Population Density | 91.9 | 1,438.3 | 93.4 |
| Land Area | 9.6 | 11.7 | 3,531,905.4 |
| Water Area | 0.2 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Brinnon, WA | Pendleton, OR | United States |
| Age 0 to 4 | 2.4% | 7.5% | 5.9% |
| Age 5 to 9 | 0.9% | 6.1% | 6.1% |
| Age 10 to 14 | 1.8% | 7.0% | 6.6% |
| Age 15 to 17 | 0.5% | 4.1% | 3.9% |
| Age 18 to 20 | 0.8% | 4.5% | 4.0% |
| Age 21 to 24 | 0.7% | 3.7% | 5.2% |
| Age 25 to 34 | 3.1% | 14.1% | 13.8% |
| Age 35 to 44 | 7.8% | 14.0% | 12.9% |
| Age 45 to 54 | 23.0% | 11.0% | 12.6% |
| Age 55 to 59 | 2.4% | 5.8% | 6.7% |
| Age 60 to 64 | 8.3% | 5.5% | 6.3% |
| Age 65 to 74 | 32.8% | 10.4% | 9.6% |
| Age 75 to 84 | 10.9% | 3.6% | 4.5% |
| Age 85 and over | 4.7% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Brinnon, WA | Pendleton, OR | United States |
| White | 88.9% | 78.4% | 59.4% |
| Black | 0.0% | 1.9% | 12.2% |
| Asian | 0.5% | 0.6% | 5.6% |
| Native American | 1.5% | 2.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.7% | 0.4% |
| Two or More Races | 6.2% | 4.2% | 3.2% |
| Hispanic | 3.0% | 12.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Brinnon, WA | Pendleton, OR | United States |
| Married Population | 63.5% | 44.8% | 49.8% |
| Currently Married | 54.7% | 42.3% | 48.0% |
| Married but Separated | 8.9% | 2.6% | 1.8% |
| Single Population | 36.5% | 55.2% | 50.2% |
| Never Married | 15.0% | 33.7% | 33.8% |
| Divorced | 12.8% | 14.8% | 10.8% |
| Widowed | 8.7% | 6.7% | 5.6% |
| space5 | | | |
| Household Size | 2.08 | 2.57 | 2.60 |
| Households | 423 | 5,876 | 124,010,992 |
| Family Households | 248 | 3,555 | 80,755,759 |
| Married couple, w/children | 11.7% | 32.9% | 30.5% |
| Married couple, no children | 79.8% | 37.1% | 42.9% |
| Non Family Households | 175 | 2,321 | 43,255,233 |
| Single householder, w/children | 6.5% | 22.4% | 15.8% |
| Single householder, no children | 2.0% | 7.6% | 10.8% |