| | Gustavus, AK | Milton-Freewater, OR | United States |
| Population | 583 | 7,143 | 329,725,481 |
| Female Population | 52.3% | 48.0% | 50.5% |
| Male Population | 47.7% | 52.0% | 49.5% |
| Median Age | 51 | 33.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 444 | 7,070 | 309,327,143 |
| Population - 2000 | 429 | 6,470 | 285,036,114 |
| Population - 1990 | 258 | 5,533 | 251,960,433 |
| Pop. 2000 to Now | 3.7% | 9.0% | 15.6% |
| Pop. 1990 to Now | 72.5% | 27.5% | 30.8% |
| space4 | | | |
| Population Density | 16.0 | 3,587.6 | 93.4 |
| Land Area | 36.4 | 2.0 | 3,531,905.4 |
| Water Area | 20.6 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Gustavus, AK | Milton-Freewater, OR | United States |
| Age 0 to 4 | 0.2% | 7.3% | 5.9% |
| Age 5 to 9 | 1.2% | 5.9% | 6.1% |
| Age 10 to 14 | 8.6% | 9.2% | 6.6% |
| Age 15 to 17 | 3.6% | 6.7% | 3.9% |
| Age 18 to 20 | 2.9% | 4.1% | 4.0% |
| Age 21 to 24 | 1.2% | 3.3% | 5.2% |
| Age 25 to 34 | 19.6% | 15.0% | 13.8% |
| Age 35 to 44 | 0.7% | 14.6% | 12.9% |
| Age 45 to 54 | 20.6% | 10.1% | 12.6% |
| Age 55 to 59 | 14.8% | 4.9% | 6.7% |
| Age 60 to 64 | 6.3% | 6.0% | 6.3% |
| Age 65 to 74 | 12.2% | 5.4% | 9.6% |
| Age 75 to 84 | 8.2% | 6.2% | 4.5% |
| Age 85 and over | 0.0% | 1.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Gustavus, AK | Milton-Freewater, OR | United States |
| White | 87.7% | 54.0% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 3.1% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.8% | 2.1% | 3.2% |
| Hispanic | 5.5% | 43.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Gustavus, AK | Milton-Freewater, OR | United States |
| Married Population | 57.1% | 45.1% | 49.8% |
| Currently Married | 56.6% | 41.4% | 48.0% |
| Married but Separated | 0.6% | 3.7% | 1.8% |
| Single Population | 42.9% | 54.9% | 50.2% |
| Never Married | 32.6% | 36.9% | 33.8% |
| Divorced | 5.3% | 14.8% | 10.8% |
| Widowed | 5.0% | 3.3% | 5.6% |
| space5 | | | |
| Household Size | 2.99 | 3.16 | 2.60 |
| Households | 188 | 2,237 | 124,010,992 |
| Family Households | 99 | 1,583 | 80,755,759 |
| Married couple, w/children | 18.2% | 36.8% | 30.5% |
| Married couple, no children | 74.7% | 25.1% | 42.9% |
| Non Family Households | 89 | 654 | 43,255,233 |
| Single householder, w/children | 7.1% | 28.7% | 15.8% |
| Single householder, no children | 0.0% | 9.4% | 10.8% |