| | Milwaukie, OR | Hood River, OR | United States |
| Population | 21,108 | 8,210 | 329,725,481 |
| Female Population | 51.5% | 50.2% | 50.5% |
| Male Population | 48.5% | 49.8% | 49.5% |
| Median Age | 39.5 | 36.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 20,572 | 7,265 | 309,327,143 |
| Population - 2000 | 20,490 | 5,831 | 285,036,114 |
| Population - 1990 | 18,692 | 4,632 | 251,960,433 |
| Pop. 2000 to Now | 2.7% | 33.7% | 15.6% |
| Pop. 1990 to Now | 12.6% | 68.2% | 30.8% |
| space4 | | | |
| Population Density | 4,305.1 | 3,158.9 | 93.4 |
| Land Area | 4.9 | 2.6 | 3,531,905.4 |
| Water Area | 0.2 | 0.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Milwaukie, OR | Hood River, OR | United States |
| Age 0 to 4 | 5.2% | 6.6% | 5.9% |
| Age 5 to 9 | 5.4% | 6.7% | 6.1% |
| Age 10 to 14 | 4.8% | 6.5% | 6.6% |
| Age 15 to 17 | 3.5% | 4.6% | 3.9% |
| Age 18 to 20 | 2.6% | 2.7% | 4.0% |
| Age 21 to 24 | 4.7% | 3.1% | 5.2% |
| Age 25 to 34 | 14.8% | 17.7% | 13.8% |
| Age 35 to 44 | 19.7% | 14.5% | 12.9% |
| Age 45 to 54 | 11.7% | 14.9% | 12.6% |
| Age 55 to 59 | 5.6% | 5.1% | 6.7% |
| Age 60 to 64 | 6.7% | 6.6% | 6.3% |
| Age 65 to 74 | 9.5% | 5.5% | 9.6% |
| Age 75 to 84 | 4.0% | 3.7% | 4.5% |
| Age 85 and over | 1.7% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Milwaukie, OR | Hood River, OR | United States |
| White | 80.6% | 65.3% | 59.4% |
| Black | 1.0% | 1.5% | 12.2% |
| Asian | 2.6% | 1.0% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.1% | 0.2% |
| Other | 0.2% | 2.4% | 0.4% |
| Two or More Races | 6.1% | 4.1% | 3.2% |
| Hispanic | 9.3% | 25.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Milwaukie, OR | Hood River, OR | United States |
| Married Population | 45.4% | 44.7% | 49.8% |
| Currently Married | 44.2% | 43.6% | 48.0% |
| Married but Separated | 1.2% | 1.1% | 1.8% |
| Single Population | 54.6% | 55.3% | 50.2% |
| Never Married | 33.4% | 39.1% | 33.8% |
| Divorced | 16.1% | 12.8% | 10.8% |
| Widowed | 5.2% | 3.4% | 5.6% |
| space5 | | | |
| Household Size | 2.26 | 2.23 | 2.60 |
| Households | 9,220 | 3,642 | 124,010,992 |
| Family Households | 5,176 | 1,967 | 80,755,759 |
| Married couple, w/children | 28.6% | 33.1% | 30.5% |
| Married couple, no children | 41.6% | 36.8% | 42.9% |
| Non Family Households | 4,044 | 1,675 | 43,255,233 |
| Single householder, w/children | 19.4% | 23.5% | 15.8% |
| Single householder, no children | 10.3% | 6.6% | 10.8% |