| | Grayridge, MO | Congress, AZ | United States |
| Population | 173 | 1,665 | 329,725,481 |
| Female Population | 52.6% | 48.4% | 50.5% |
| Male Population | 47.4% | 51.6% | 49.5% |
| Median Age | 18.9 | 69.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 134 | 1,575 | 309,327,143 |
| Population - 2000 | 102 | 1,717 | 285,036,114 |
| Population - 1990 | 113 | 837 | 251,960,433 |
| Pop. 2000 to Now | 25.5% | -8.0% | 15.6% |
| Pop. 1990 to Now | 13.3% | 88.8% | 30.8% |
| space4 | | | |
| Population Density | 169.9 | 44.2 | 93.4 |
| Land Area | 1.0 | 37.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Grayridge, MO | Congress, AZ | United States |
| Age 0 to 4 | 1.2% | 1.7% | 5.9% |
| Age 5 to 9 | 10.4% | 3.1% | 6.1% |
| Age 10 to 14 | 17.9% | 4.6% | 6.6% |
| Age 15 to 17 | 12.7% | 1.5% | 3.9% |
| Age 18 to 20 | 8.7% | 0.0% | 4.0% |
| Age 21 to 24 | 0.0% | 0.0% | 5.2% |
| Age 25 to 34 | 9.2% | 10.0% | 13.8% |
| Age 35 to 44 | 10.4% | 1.3% | 12.9% |
| Age 45 to 54 | 5.2% | 2.6% | 12.6% |
| Age 55 to 59 | 8.7% | 5.3% | 6.7% |
| Age 60 to 64 | 1.7% | 8.8% | 6.3% |
| Age 65 to 74 | 13.9% | 36.3% | 9.6% |
| Age 75 to 84 | 0.0% | 18.4% | 4.5% |
| Age 85 and over | 0.0% | 6.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Grayridge, MO | Congress, AZ | United States |
| White | 87.9% | 93.6% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.7% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 3.4% | 0.4% |
| Two or More Races | 0.0% | 0.0% | 3.2% |
| Hispanic | 12.1% | 2.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Grayridge, MO | Congress, AZ | United States |
| Married Population | 33.6% | 77.0% | 49.8% |
| Currently Married | 31.1% | 75.4% | 48.0% |
| Married but Separated | 2.5% | 1.7% | 1.8% |
| Single Population | 66.4% | 23.0% | 50.2% |
| Never Married | 32.8% | 7.6% | 33.8% |
| Divorced | 14.8% | 5.4% | 10.8% |
| Widowed | 18.9% | 9.9% | 5.6% |
| space5 | | | |
| Household Size | 4.81 | 2.18 | 2.60 |
| Households | 36 | 763 | 124,010,992 |
| Family Households | 30 | 597 | 80,755,759 |
| Married couple, w/children | 36.7% | 8.7% | 30.5% |
| Married couple, no children | 26.7% | 79.4% | 42.9% |
| Non Family Households | 6 | 166 | 43,255,233 |
| Single householder, w/children | 30.0% | 0.0% | 15.8% |
| Single householder, no children | 6.7% | 11.9% | 10.8% |