| | Idanha, OR | Silverton, OR | United States |
| Population | 155 | 10,402 | 329,725,481 |
| Female Population | 47.7% | 52.4% | 50.5% |
| Male Population | 52.3% | 47.6% | 49.5% |
| Median Age | 66 | 39.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 149 | 9,259 | 309,327,143 |
| Population - 2000 | 232 | 7,414 | 285,036,114 |
| Population - 1990 | 289 | 5,635 | 251,960,433 |
| Pop. 2000 to Now | -30.2% | 43.2% | 15.6% |
| Pop. 1990 to Now | -43.9% | 88.4% | 30.8% |
| space4 | | | |
| Population Density | 144.7 | 2,968.6 | 93.4 |
| Land Area | 1.1 | 3.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Idanha, OR | Silverton, OR | United States |
| Age 0 to 4 | 0.0% | 7.0% | 5.9% |
| Age 5 to 9 | 1.9% | 7.4% | 6.1% |
| Age 10 to 14 | 0.0% | 6.5% | 6.6% |
| Age 15 to 17 | 0.0% | 3.9% | 3.9% |
| Age 18 to 20 | 0.0% | 4.2% | 4.0% |
| Age 21 to 24 | 0.0% | 3.1% | 5.2% |
| Age 25 to 34 | 6.5% | 11.4% | 13.8% |
| Age 35 to 44 | 7.1% | 13.3% | 12.9% |
| Age 45 to 54 | 3.9% | 11.8% | 12.6% |
| Age 55 to 59 | 12.9% | 6.4% | 6.7% |
| Age 60 to 64 | 11.0% | 7.3% | 6.3% |
| Age 65 to 74 | 45.2% | 11.1% | 9.6% |
| Age 75 to 84 | 11.6% | 5.6% | 4.5% |
| Age 85 and over | 0.0% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Idanha, OR | Silverton, OR | United States |
| White | 89.0% | 83.0% | 59.4% |
| Black | 0.0% | 0.2% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 2.6% | 6.1% | 3.2% |
| Hispanic | 8.4% | 9.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Idanha, OR | Silverton, OR | United States |
| Married Population | 80.9% | 54.5% | 49.8% |
| Currently Married | 80.9% | 52.4% | 48.0% |
| Married but Separated | 0.0% | 2.1% | 1.8% |
| Single Population | 19.1% | 45.5% | 50.2% |
| Never Married | 4.6% | 23.8% | 33.8% |
| Divorced | 12.5% | 15.2% | 10.8% |
| Widowed | 2.0% | 6.5% | 5.6% |
| space5 | | | |
| Household Size | 2.21 | 2.65 | 2.60 |
| Households | 70 | 3,894 | 124,010,992 |
| Family Households | 58 | 2,694 | 80,755,759 |
| Married couple, w/children | 0.0% | 30.4% | 30.5% |
| Married couple, no children | 98.3% | 46.1% | 42.9% |
| Non Family Households | 12 | 1,200 | 43,255,233 |
| Single householder, w/children | 0.0% | 18.7% | 15.8% |
| Single householder, no children | 1.7% | 4.8% | 10.8% |