| | Ione, OR | Grass Valley, OR | United States |
| Population | 404 | 259 | 329,725,481 |
| Female Population | 44.8% | 52.1% | 50.5% |
| Male Population | 55.2% | 47.9% | 49.5% |
| Median Age | 52.1 | 35.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 330 | 165 | 309,327,143 |
| Population - 2000 | 321 | 171 | 285,036,114 |
| Population - 1990 | 255 | 160 | 251,960,433 |
| Pop. 2000 to Now | 2.5% | -2.3% | 15.6% |
| Pop. 1990 to Now | 29.0% | 4.4% | 30.8% |
| space4 | | | |
| Population Density | 582.1 | 508.8 | 93.4 |
| Land Area | 0.7 | 0.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Ione, OR | Grass Valley, OR | United States |
| Age 0 to 4 | 4.2% | 8.5% | 5.9% |
| Age 5 to 9 | 5.9% | 1.9% | 6.1% |
| Age 10 to 14 | 4.5% | 6.6% | 6.6% |
| Age 15 to 17 | 1.5% | 2.7% | 3.9% |
| Age 18 to 20 | 5.9% | 13.1% | 4.0% |
| Age 21 to 24 | 1.0% | 1.2% | 5.2% |
| Age 25 to 34 | 5.0% | 15.4% | 13.8% |
| Age 35 to 44 | 6.2% | 12.0% | 12.9% |
| Age 45 to 54 | 23.3% | 8.9% | 12.6% |
| Age 55 to 59 | 7.9% | 1.9% | 6.7% |
| Age 60 to 64 | 11.4% | 4.6% | 6.3% |
| Age 65 to 74 | 17.8% | 11.6% | 9.6% |
| Age 75 to 84 | 4.5% | 10.4% | 4.5% |
| Age 85 and over | 1.0% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Ione, OR | Grass Valley, OR | United States |
| White | 79.2% | 89.6% | 59.4% |
| Black | 0.0% | 1.2% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 4.7% | 6.6% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.5% | 1.2% | 3.2% |
| Hispanic | 11.6% | 1.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Ione, OR | Grass Valley, OR | United States |
| Married Population | 55.4% | 56.3% | 49.8% |
| Currently Married | 53.3% | 54.4% | 48.0% |
| Married but Separated | 2.0% | 1.9% | 1.8% |
| Single Population | 44.6% | 43.7% | 50.2% |
| Never Married | 18.8% | 29.8% | 33.8% |
| Divorced | 18.6% | 10.7% | 10.8% |
| Widowed | 7.2% | 3.3% | 5.6% |
| space5 | | | |
| Household Size | 2.27 | 2.87 | 2.60 |
| Households | 178 | 86 | 124,010,992 |
| Family Households | 110 | 59 | 80,755,759 |
| Married couple, w/children | 23.6% | 44.1% | 30.5% |
| Married couple, no children | 62.7% | 30.5% | 42.9% |
| Non Family Households | 68 | 27 | 43,255,233 |
| Single householder, w/children | 6.4% | 25.4% | 15.8% |
| Single householder, no children | 7.3% | 0.0% | 10.8% |