| | Grass Valley, OR | Dufur, OR | United States |
| Population | 259 | 897 | 329,725,481 |
| Female Population | 52.1% | 39.7% | 50.5% |
| Male Population | 47.9% | 60.3% | 49.5% |
| Median Age | 35.2 | 35.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 165 | 606 | 309,327,143 |
| Population - 2000 | 171 | 588 | 285,036,114 |
| Population - 1990 | 160 | 527 | 251,960,433 |
| Pop. 2000 to Now | -2.3% | 7.8% | 15.6% |
| Pop. 1990 to Now | 4.4% | 20.3% | 30.8% |
| space4 | | | |
| Population Density | 508.8 | 1,536.0 | 93.4 |
| Land Area | 0.5 | 0.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Grass Valley, OR | Dufur, OR | United States |
| Age 0 to 4 | 8.5% | 11.3% | 5.9% |
| Age 5 to 9 | 1.9% | 8.0% | 6.1% |
| Age 10 to 14 | 6.6% | 7.1% | 6.6% |
| Age 15 to 17 | 2.7% | 2.5% | 3.9% |
| Age 18 to 20 | 13.1% | 5.2% | 4.0% |
| Age 21 to 24 | 1.2% | 3.1% | 5.2% |
| Age 25 to 34 | 15.4% | 10.7% | 13.8% |
| Age 35 to 44 | 12.0% | 13.5% | 12.9% |
| Age 45 to 54 | 8.9% | 10.1% | 12.6% |
| Age 55 to 59 | 1.9% | 4.0% | 6.7% |
| Age 60 to 64 | 4.6% | 6.1% | 6.3% |
| Age 65 to 74 | 11.6% | 8.4% | 9.6% |
| Age 75 to 84 | 10.4% | 7.2% | 4.5% |
| Age 85 and over | 1.2% | 2.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Grass Valley, OR | Dufur, OR | United States |
| White | 89.6% | 86.6% | 59.4% |
| Black | 1.2% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 6.6% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.2% | 6.7% | 3.2% |
| Hispanic | 1.5% | 6.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Grass Valley, OR | Dufur, OR | United States |
| Married Population | 56.3% | 58.0% | 49.8% |
| Currently Married | 54.4% | 57.0% | 48.0% |
| Married but Separated | 1.9% | 1.1% | 1.8% |
| Single Population | 43.7% | 42.0% | 50.2% |
| Never Married | 29.8% | 25.0% | 33.8% |
| Divorced | 10.7% | 8.2% | 10.8% |
| Widowed | 3.3% | 8.8% | 5.6% |
| space5 | | | |
| Household Size | 2.87 | 2.67 | 2.60 |
| Households | 86 | 336 | 124,010,992 |
| Family Households | 59 | 222 | 80,755,759 |
| Married couple, w/children | 44.1% | 28.4% | 30.5% |
| Married couple, no children | 30.5% | 52.7% | 42.9% |
| Non Family Households | 27 | 114 | 43,255,233 |
| Single householder, w/children | 25.4% | 8.6% | 15.8% |
| Single householder, no children | 0.0% | 10.4% | 10.8% |