| | Grand Ronde, OR | Willamina, OR | United States |
| Population | 1,334 | 2,511 | 329,725,481 |
| Female Population | 60.7% | 53.5% | 50.5% |
| Male Population | 39.4% | 46.5% | 49.5% |
| Median Age | 33.5 | 35.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,335 | 2,039 | 309,327,143 |
| Population - 2000 | 271 | 1,844 | 285,036,114 |
| Population - 1990 | 1,247 | 1,717 | 251,960,433 |
| Pop. 2000 to Now | 582.7% | 22.8% | 15.6% |
| Pop. 1990 to Now | 48.4% | 31.9% | 30.8% |
| space4 | | | |
| Population Density | 69.5 | 2,723.4 | 93.4 |
| Land Area | 19.2 | 0.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Grand Ronde, OR | Willamina, OR | United States |
| Age 0 to 4 | 11.4% | 8.4% | 5.9% |
| Age 5 to 9 | 7.9% | 5.7% | 6.1% |
| Age 10 to 14 | 9.7% | 10.9% | 6.6% |
| Age 15 to 17 | 1.8% | 2.2% | 3.9% |
| Age 18 to 20 | 1.7% | 2.1% | 4.0% |
| Age 21 to 24 | 7.4% | 5.9% | 5.2% |
| Age 25 to 34 | 10.7% | 13.7% | 13.8% |
| Age 35 to 44 | 12.0% | 11.0% | 12.9% |
| Age 45 to 54 | 8.2% | 11.4% | 12.6% |
| Age 55 to 59 | 11.3% | 8.5% | 6.7% |
| Age 60 to 64 | 5.9% | 5.5% | 6.3% |
| Age 65 to 74 | 8.5% | 7.8% | 9.6% |
| Age 75 to 84 | 2.9% | 3.7% | 4.5% |
| Age 85 and over | 0.5% | 3.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Grand Ronde, OR | Willamina, OR | United States |
| White | 40.7% | 81.3% | 59.4% |
| Black | 0.6% | 0.0% | 12.2% |
| Asian | 1.9% | 0.4% | 5.6% |
| Native American | 31.9% | 3.7% | 0.6% |
| Hawaiian, Pacific Islander | 0.3% | 0.2% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 16.6% | 2.3% | 3.2% |
| Hispanic | 7.9% | 12.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Grand Ronde, OR | Willamina, OR | United States |
| Married Population | 52.2% | 51.3% | 49.8% |
| Currently Married | 49.6% | 50.3% | 48.0% |
| Married but Separated | 2.6% | 1.1% | 1.8% |
| Single Population | 47.8% | 48.7% | 50.2% |
| Never Married | 30.5% | 26.6% | 33.8% |
| Divorced | 12.8% | 16.9% | 10.8% |
| Widowed | 4.5% | 5.1% | 5.6% |
| space5 | | | |
| Household Size | 2.59 | 2.95 | 2.60 |
| Households | 511 | 852 | 124,010,992 |
| Family Households | 348 | 584 | 80,755,759 |
| Married couple, w/children | 23.3% | 32.5% | 30.5% |
| Married couple, no children | 31.6% | 35.8% | 42.9% |
| Non Family Households | 163 | 268 | 43,255,233 |
| Single householder, w/children | 37.1% | 19.0% | 15.8% |
| Single householder, no children | 8.0% | 12.7% | 10.8% |