| | Reardan, WA | Quincy, WA | United States |
| Population | 545 | 7,630 | 329,725,481 |
| Female Population | 40.0% | 50.5% | 50.5% |
| Male Population | 60.0% | 49.5% | 49.5% |
| Median Age | 42.7 | 24 | 38.4 |
| space3 | | | |
| Population - 2010 | 570 | 6,808 | 309,327,143 |
| Population - 2000 | 608 | 5,044 | 285,036,114 |
| Population - 1990 | 482 | 3,738 | 251,960,433 |
| Pop. 2000 to Now | 2.1% | 66.3% | 15.6% |
| Pop. 1990 to Now | 28.8% | 124.4% | 30.8% |
| space4 | | | |
| Population Density | 1,094.4 | 1,275.3 | 93.4 |
| Land Area | 0.5 | 6.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Reardan, WA | Quincy, WA | United States |
| Age 0 to 4 | 2.8% | 9.9% | 5.9% |
| Age 5 to 9 | 6.4% | 14.6% | 6.1% |
| Age 10 to 14 | 8.4% | 13.5% | 6.6% |
| Age 15 to 17 | 1.1% | 3.5% | 3.9% |
| Age 18 to 20 | 2.0% | 3.8% | 4.0% |
| Age 21 to 24 | 3.9% | 5.3% | 5.2% |
| Age 25 to 34 | 10.3% | 18.8% | 13.8% |
| Age 35 to 44 | 15.8% | 10.1% | 12.9% |
| Age 45 to 54 | 5.5% | 6.3% | 12.6% |
| Age 55 to 59 | 12.7% | 3.6% | 6.7% |
| Age 60 to 64 | 7.5% | 3.2% | 6.3% |
| Age 65 to 74 | 8.4% | 3.4% | 9.6% |
| Age 75 to 84 | 11.6% | 3.0% | 4.5% |
| Age 85 and over | 3.7% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Reardan, WA | Quincy, WA | United States |
| White | 87.9% | 17.6% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 1.5% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 1.7% | 1.3% | 3.2% |
| Hispanic | 8.6% | 81.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Reardan, WA | Quincy, WA | United States |
| Married Population | 67.7% | 61.3% | 49.8% |
| Currently Married | 67.7% | 59.3% | 48.0% |
| Married but Separated | 0.0% | 2.0% | 1.8% |
| Single Population | 32.3% | 38.7% | 50.2% |
| Never Married | 18.3% | 29.3% | 33.8% |
| Divorced | 7.4% | 5.1% | 10.8% |
| Widowed | 6.7% | 4.3% | 5.6% |
| space5 | | | |
| Household Size | 2.06 | 3.69 | 2.60 |
| Households | 264 | 2,065 | 124,010,992 |
| Family Households | 144 | 1,698 | 80,755,759 |
| Married couple, w/children | 23.6% | 48.4% | 30.5% |
| Married couple, no children | 74.3% | 18.7% | 42.9% |
| Non Family Households | 120 | 367 | 43,255,233 |
| Single householder, w/children | 0.0% | 26.0% | 15.8% |
| Single householder, no children | 2.1% | 6.9% | 10.8% |