| | Congress, AZ | Prescott Valley, AZ | United States |
| Population | 1,665 | 46,014 | 329,725,481 |
| Female Population | 48.4% | 50.8% | 50.5% |
| Male Population | 51.6% | 49.2% | 49.5% |
| Median Age | 69.7 | 47.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,575 | 38,822 | 309,327,143 |
| Population - 2000 | 1,717 | 23,535 | 285,036,114 |
| Population - 1990 | 837 | 8,858 | 251,960,433 |
| Pop. 2000 to Now | -8.0% | 103.5% | 15.6% |
| Pop. 1990 to Now | 88.8% | 440.8% | 30.8% |
| space4 | | | |
| Population Density | 44.2 | 1,125.2 | 93.4 |
| Land Area | 37.7 | 40.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Congress, AZ | Prescott Valley, AZ | United States |
| Age 0 to 4 | 1.7% | 4.4% | 5.9% |
| Age 5 to 9 | 3.1% | 6.3% | 6.1% |
| Age 10 to 14 | 4.6% | 5.1% | 6.6% |
| Age 15 to 17 | 1.5% | 3.3% | 3.9% |
| Age 18 to 20 | 0.0% | 3.5% | 4.0% |
| Age 21 to 24 | 0.0% | 3.4% | 5.2% |
| Age 25 to 34 | 10.0% | 11.6% | 13.8% |
| Age 35 to 44 | 1.3% | 9.7% | 12.9% |
| Age 45 to 54 | 2.6% | 11.6% | 12.6% |
| Age 55 to 59 | 5.3% | 5.5% | 6.7% |
| Age 60 to 64 | 8.8% | 7.1% | 6.3% |
| Age 65 to 74 | 36.3% | 16.7% | 9.6% |
| Age 75 to 84 | 18.4% | 8.5% | 4.5% |
| Age 85 and over | 6.6% | 3.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Congress, AZ | Prescott Valley, AZ | United States |
| White | 93.6% | 75.1% | 59.4% |
| Black | 0.0% | 0.6% | 12.2% |
| Asian | 0.0% | 1.0% | 5.6% |
| Native American | 0.7% | 1.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 3.4% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 2.8% | 3.2% |
| Hispanic | 2.3% | 19.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Congress, AZ | Prescott Valley, AZ | United States |
| Married Population | 77.0% | 53.3% | 49.8% |
| Currently Married | 75.4% | 51.9% | 48.0% |
| Married but Separated | 1.7% | 1.4% | 1.8% |
| Single Population | 23.0% | 46.7% | 50.2% |
| Never Married | 7.6% | 22.7% | 33.8% |
| Divorced | 5.4% | 16.3% | 10.8% |
| Widowed | 9.9% | 7.8% | 5.6% |
| space5 | | | |
| Household Size | 2.18 | 2.37 | 2.60 |
| Households | 763 | 19,357 | 124,010,992 |
| Family Households | 597 | 12,586 | 80,755,759 |
| Married couple, w/children | 8.7% | 24.1% | 30.5% |
| Married couple, no children | 79.4% | 51.9% | 42.9% |
| Non Family Households | 166 | 6,771 | 43,255,233 |
| Single householder, w/children | 0.0% | 14.6% | 15.8% |
| Single householder, no children | 11.9% | 9.5% | 10.8% |