| | Quilcene, WA | Belfair, WA | United States |
| Population | 521 | 4,179 | 329,725,481 |
| Female Population | 51.8% | 43.2% | 50.5% |
| Male Population | 48.2% | 56.8% | 49.5% |
| Median Age | 45.8 | 39.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 703 | 3,199 | 309,327,143 |
| Population - 2000 | 591 | 3,325 | 285,036,114 |
| Population - 1990 | 595 | 2,592 | 251,960,433 |
| Pop. 2000 to Now | -21.3% | 36.7% | 15.6% |
| Pop. 1990 to Now | -21.9% | 75.3% | 30.8% |
| space4 | | | |
| Population Density | 59.1 | 567.3 | 93.4 |
| Land Area | 8.8 | 7.4 | 3,531,905.4 |
| Water Area | 0.4 | 0.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Quilcene, WA | Belfair, WA | United States |
| Age 0 to 4 | 4.8% | 4.2% | 5.9% |
| Age 5 to 9 | 3.3% | 6.1% | 6.1% |
| Age 10 to 14 | 4.4% | 6.4% | 6.6% |
| Age 15 to 17 | 6.1% | 3.4% | 3.9% |
| Age 18 to 20 | 1.9% | 2.3% | 4.0% |
| Age 21 to 24 | 8.8% | 6.1% | 5.2% |
| Age 25 to 34 | 11.1% | 19.8% | 13.8% |
| Age 35 to 44 | 8.1% | 10.0% | 12.9% |
| Age 45 to 54 | 15.9% | 10.7% | 12.6% |
| Age 55 to 59 | 6.3% | 5.1% | 6.7% |
| Age 60 to 64 | 0.0% | 9.7% | 6.3% |
| Age 65 to 74 | 22.3% | 13.8% | 9.6% |
| Age 75 to 84 | 6.9% | 2.2% | 4.5% |
| Age 85 and over | 0.0% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Quilcene, WA | Belfair, WA | United States |
| White | 85.0% | 73.3% | 59.4% |
| Black | 0.0% | 3.4% | 12.2% |
| Asian | 6.7% | 3.9% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 8.3% | 4.8% | 3.2% |
| Hispanic | 0.0% | 14.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Quilcene, WA | Belfair, WA | United States |
| Married Population | 52.0% | 46.6% | 49.8% |
| Currently Married | 52.0% | 45.3% | 48.0% |
| Married but Separated | 0.0% | 1.3% | 1.8% |
| Single Population | 48.0% | 53.4% | 50.2% |
| Never Married | 23.5% | 34.0% | 33.8% |
| Divorced | 18.4% | 17.5% | 10.8% |
| Widowed | 6.1% | 1.9% | 5.6% |
| space5 | | | |
| Household Size | 2.42 | 2.28 | 2.60 |
| Households | 215 | 1,830 | 124,010,992 |
| Family Households | 122 | 998 | 80,755,759 |
| Married couple, w/children | 19.7% | 42.2% | 30.5% |
| Married couple, no children | 43.4% | 37.7% | 42.9% |
| Non Family Households | 93 | 832 | 43,255,233 |
| Single householder, w/children | 12.3% | 13.0% | 15.8% |
| Single householder, no children | 24.6% | 7.1% | 10.8% |