| | Parker, AZ | Douglas, AZ | United States |
| Population | 3,324 | 16,470 | 329,725,481 |
| Female Population | 49.3% | 40.9% | 50.5% |
| Male Population | 50.7% | 59.1% | 49.5% |
| Median Age | 36.1 | 32.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,060 | 17,606 | 309,327,143 |
| Population - 2000 | 3,140 | 14,312 | 285,036,114 |
| Population - 1990 | 2,897 | 12,822 | 251,960,433 |
| Pop. 2000 to Now | 4.5% | 15.0% | 15.6% |
| Pop. 1990 to Now | 13.3% | 28.4% | 30.8% |
| space4 | | | |
| Population Density | 151.3 | 1,648.5 | 93.4 |
| Land Area | 22.0 | 10.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Parker, AZ | Douglas, AZ | United States |
| Age 0 to 4 | 7.7% | 8.0% | 5.9% |
| Age 5 to 9 | 6.2% | 5.7% | 6.1% |
| Age 10 to 14 | 7.6% | 5.1% | 6.6% |
| Age 15 to 17 | 4.1% | 4.0% | 3.9% |
| Age 18 to 20 | 3.6% | 5.8% | 4.0% |
| Age 21 to 24 | 7.0% | 5.9% | 5.2% |
| Age 25 to 34 | 13.1% | 19.4% | 13.8% |
| Age 35 to 44 | 15.5% | 13.7% | 12.9% |
| Age 45 to 54 | 12.5% | 9.8% | 12.6% |
| Age 55 to 59 | 6.0% | 5.4% | 6.7% |
| Age 60 to 64 | 3.9% | 4.9% | 6.3% |
| Age 65 to 74 | 7.8% | 7.4% | 9.6% |
| Age 75 to 84 | 4.1% | 3.9% | 4.5% |
| Age 85 and over | 0.8% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Parker, AZ | Douglas, AZ | United States |
| White | 25.2% | 11.6% | 59.4% |
| Black | 0.5% | 3.5% | 12.2% |
| Asian | 0.4% | 0.1% | 5.6% |
| Native American | 13.6% | 0.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.1% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 5.3% | 0.8% | 3.2% |
| Hispanic | 54.8% | 82.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Parker, AZ | Douglas, AZ | United States |
| Married Population | 54.4% | 37.2% | 49.8% |
| Currently Married | 51.4% | 34.4% | 48.0% |
| Married but Separated | 3.0% | 2.8% | 1.8% |
| Single Population | 45.6% | 62.8% | 50.2% |
| Never Married | 27.1% | 45.6% | 33.8% |
| Divorced | 13.3% | 11.8% | 10.8% |
| Widowed | 5.3% | 5.4% | 5.6% |
| space5 | | | |
| Household Size | 2.50 | 2.93 | 2.60 |
| Households | 1,295 | 4,446 | 124,010,992 |
| Family Households | 964 | 3,080 | 80,755,759 |
| Married couple, w/children | 37.1% | 31.2% | 30.5% |
| Married couple, no children | 27.9% | 31.7% | 42.9% |
| Non Family Households | 331 | 1,366 | 43,255,233 |
| Single householder, w/children | 27.2% | 27.2% | 15.8% |
| Single householder, no children | 7.8% | 9.8% | 10.8% |