| | Seward, AK | Irrigon, OR | United States |
| Population | 2,614 | 1,993 | 329,725,481 |
| Female Population | 37.4% | 49.0% | 50.5% |
| Male Population | 62.6% | 51.0% | 49.5% |
| Median Age | 43.5 | 31.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,727 | 1,813 | 309,327,143 |
| Population - 2000 | 2,830 | 1,702 | 285,036,114 |
| Population - 1990 | 2,699 | 737 | 251,960,433 |
| Pop. 2000 to Now | 3.4% | 5.7% | 15.6% |
| Pop. 1990 to Now | 8.5% | 144.1% | 30.8% |
| space4 | | | |
| Population Density | 187.3 | 1,535.4 | 93.4 |
| Land Area | 14.0 | 1.3 | 3,531,905.4 |
| Water Area | 7.9 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Seward, AK | Irrigon, OR | United States |
| Age 0 to 4 | 4.4% | 5.8% | 5.9% |
| Age 5 to 9 | 4.6% | 10.7% | 6.1% |
| Age 10 to 14 | 7.9% | 5.9% | 6.6% |
| Age 15 to 17 | 2.4% | 6.0% | 3.9% |
| Age 18 to 20 | 1.3% | 3.1% | 4.0% |
| Age 21 to 24 | 4.2% | 7.0% | 5.2% |
| Age 25 to 34 | 15.3% | 15.3% | 13.8% |
| Age 35 to 44 | 14.6% | 11.3% | 12.9% |
| Age 45 to 54 | 14.7% | 10.3% | 12.6% |
| Age 55 to 59 | 4.8% | 8.0% | 6.7% |
| Age 60 to 64 | 10.2% | 3.7% | 6.3% |
| Age 65 to 74 | 10.3% | 9.3% | 9.6% |
| Age 75 to 84 | 2.0% | 3.4% | 4.5% |
| Age 85 and over | 3.3% | 0.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Seward, AK | Irrigon, OR | United States |
| White | 62.5% | 55.7% | 59.4% |
| Black | 2.7% | 0.0% | 12.2% |
| Asian | 1.3% | 1.5% | 5.6% |
| Native American | 14.9% | 1.7% | 0.6% |
| Hawaiian, Pacific Islander | 4.6% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 4.6% | 3.3% | 3.2% |
| Hispanic | 9.3% | 37.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Seward, AK | Irrigon, OR | United States |
| Married Population | 41.3% | 52.5% | 49.8% |
| Currently Married | 39.3% | 51.6% | 48.0% |
| Married but Separated | 2.0% | 1.0% | 1.8% |
| Single Population | 58.7% | 47.5% | 50.2% |
| Never Married | 41.2% | 31.3% | 33.8% |
| Divorced | 9.3% | 10.5% | 10.8% |
| Widowed | 8.1% | 5.6% | 5.6% |
| space5 | | | |
| Household Size | 2.19 | 2.86 | 2.60 |
| Households | 977 | 698 | 124,010,992 |
| Family Households | 545 | 474 | 80,755,759 |
| Married couple, w/children | 22.6% | 45.8% | 30.5% |
| Married couple, no children | 49.7% | 28.7% | 42.9% |
| Non Family Households | 432 | 224 | 43,255,233 |
| Single householder, w/children | 22.8% | 21.9% | 15.8% |
| Single householder, no children | 5.0% | 3.6% | 10.8% |