| | Sumner, WA | Oak Harbor, WA | United States |
| Population | 10,545 | 24,267 | 329,725,481 |
| Female Population | 51.4% | 52.7% | 50.5% |
| Male Population | 48.6% | 47.3% | 49.5% |
| Median Age | 35.8 | 31.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 9,435 | 22,212 | 309,327,143 |
| Population - 2000 | 8,504 | 19,795 | 285,036,114 |
| Population - 1990 | 6,281 | 17,176 | 251,960,433 |
| Pop. 2000 to Now | 24.1% | 19.4% | 15.6% |
| Pop. 1990 to Now | 68.0% | 37.7% | 30.8% |
| space4 | | | |
| Population Density | 1,401.0 | 2,522.8 | 93.4 |
| Land Area | 7.5 | 9.6 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Sumner, WA | Oak Harbor, WA | United States |
| Age 0 to 4 | 7.3% | 10.8% | 5.9% |
| Age 5 to 9 | 5.7% | 7.1% | 6.1% |
| Age 10 to 14 | 5.7% | 7.9% | 6.6% |
| Age 15 to 17 | 3.3% | 2.8% | 3.9% |
| Age 18 to 20 | 2.8% | 2.4% | 4.0% |
| Age 21 to 24 | 2.8% | 6.2% | 5.2% |
| Age 25 to 34 | 21.0% | 19.6% | 13.8% |
| Age 35 to 44 | 13.2% | 16.1% | 12.9% |
| Age 45 to 54 | 12.5% | 6.7% | 12.6% |
| Age 55 to 59 | 4.7% | 3.8% | 6.7% |
| Age 60 to 64 | 5.9% | 4.2% | 6.3% |
| Age 65 to 74 | 9.3% | 7.3% | 9.6% |
| Age 75 to 84 | 4.2% | 3.2% | 4.5% |
| Age 85 and over | 1.8% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Sumner, WA | Oak Harbor, WA | United States |
| White | 76.4% | 59.7% | 59.4% |
| Black | 0.9% | 5.2% | 12.2% |
| Asian | 1.3% | 8.7% | 5.6% |
| Native American | 0.0% | 1.3% | 0.6% |
| Hawaiian, Pacific Islander | 1.1% | 0.5% | 0.2% |
| Other | 0.2% | 0.4% | 0.4% |
| Two or More Races | 4.5% | 8.1% | 3.2% |
| Hispanic | 15.7% | 16.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Sumner, WA | Oak Harbor, WA | United States |
| Married Population | 47.6% | 58.7% | 49.8% |
| Currently Married | 43.6% | 56.8% | 48.0% |
| Married but Separated | 4.0% | 1.9% | 1.8% |
| Single Population | 52.4% | 41.3% | 50.2% |
| Never Married | 33.1% | 25.0% | 33.8% |
| Divorced | 15.1% | 11.2% | 10.8% |
| Widowed | 4.3% | 5.1% | 5.6% |
| space5 | | | |
| Household Size | 2.47 | 2.52 | 2.60 |
| Households | 4,255 | 9,593 | 124,010,992 |
| Family Households | 2,696 | 6,346 | 80,755,759 |
| Married couple, w/children | 27.2% | 38.8% | 30.5% |
| Married couple, no children | 41.5% | 38.3% | 42.9% |
| Non Family Households | 1,559 | 3,247 | 43,255,233 |
| Single householder, w/children | 21.7% | 15.8% | 15.8% |
| Single householder, no children | 9.6% | 7.1% | 10.8% |