| | Ilwaco, WA | Sitka, AK | United States |
| Population | 1,725 | 8,518 | 329,725,481 |
| Female Population | 49.5% | 48.3% | 50.5% |
| Male Population | 50.5% | 51.7% | 49.5% |
| Median Age | 38.4 | 39.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 933 | 8,880 | 309,327,143 |
| Population - 2000 | 950 | 8,835 | 285,036,114 |
| Population - 1990 | 815 | 8,588 | 251,960,433 |
| Pop. 2000 to Now | 5.9% | -4.9% | 15.6% |
| Pop. 1990 to Now | 23.4% | -2.1% | 30.8% |
| space4 | | | |
| Population Density | 832.9 | 3.0 | 93.4 |
| Land Area | 2.1 | 2,870.0 | 3,531,905.4 |
| Water Area | 0.1 | 1,945.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Ilwaco, WA | Sitka, AK | United States |
| Age 0 to 4 | 6.0% | 4.9% | 5.9% |
| Age 5 to 9 | 6.0% | 5.2% | 6.1% |
| Age 10 to 14 | 5.1% | 7.2% | 6.6% |
| Age 15 to 17 | 1.2% | 3.8% | 3.9% |
| Age 18 to 20 | 0.3% | 3.1% | 4.0% |
| Age 21 to 24 | 4.4% | 4.4% | 5.2% |
| Age 25 to 34 | 24.6% | 14.3% | 13.8% |
| Age 35 to 44 | 5.7% | 14.7% | 12.9% |
| Age 45 to 54 | 9.8% | 11.7% | 12.6% |
| Age 55 to 59 | 4.5% | 7.3% | 6.7% |
| Age 60 to 64 | 6.1% | 7.6% | 6.3% |
| Age 65 to 74 | 17.3% | 10.1% | 9.6% |
| Age 75 to 84 | 6.0% | 4.6% | 4.5% |
| Age 85 and over | 3.0% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Ilwaco, WA | Sitka, AK | United States |
| White | 83.5% | 61.4% | 59.4% |
| Black | 0.0% | 0.5% | 12.2% |
| Asian | 0.0% | 7.3% | 5.6% |
| Native American | 0.0% | 9.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.9% | 0.3% | 0.4% |
| Two or More Races | 5.9% | 13.4% | 3.2% |
| Hispanic | 9.5% | 7.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Ilwaco, WA | Sitka, AK | United States |
| Married Population | 49.8% | 55.0% | 49.8% |
| Currently Married | 48.5% | 53.4% | 48.0% |
| Married but Separated | 1.3% | 1.5% | 1.8% |
| Single Population | 50.2% | 45.0% | 50.2% |
| Never Married | 31.6% | 28.2% | 33.8% |
| Divorced | 13.9% | 12.1% | 10.8% |
| Widowed | 4.7% | 4.7% | 5.6% |
| space5 | | | |
| Household Size | 3.53 | 2.41 | 2.60 |
| Households | 487 | 3,439 | 124,010,992 |
| Family Households | 371 | 2,172 | 80,755,759 |
| Married couple, w/children | 16.2% | 30.6% | 30.5% |
| Married couple, no children | 49.6% | 49.8% | 42.9% |
| Non Family Households | 116 | 1,267 | 43,255,233 |
| Single householder, w/children | 28.3% | 12.9% | 15.8% |
| Single householder, no children | 5.9% | 6.7% | 10.8% |