| | St. Mary, MO | Chipley, FL | United States |
| Population | 176 | 3,599 | 329,725,481 |
| Female Population | 56.8% | 49.7% | 50.5% |
| Male Population | 43.2% | 50.3% | 49.5% |
| Median Age | 54.2 | 33.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 362 | 3,605 | 309,327,143 |
| Population - 2000 | 377 | 3,592 | 285,036,114 |
| Population - 1990 | 461 | 3,866 | 251,960,433 |
| Pop. 2000 to Now | -8.5% | 2.6% | 15.6% |
| Pop. 1990 to Now | -25.2% | -4.7% | 30.8% |
| space4 | | | |
| Population Density | 293.8 | 847.8 | 93.4 |
| Land Area | 0.6 | 4.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | St. Mary, MO | Chipley, FL | United States |
| Age 0 to 4 | 1.7% | 6.2% | 5.9% |
| Age 5 to 9 | 4.5% | 9.5% | 6.1% |
| Age 10 to 14 | 1.1% | 7.7% | 6.6% |
| Age 15 to 17 | 1.7% | 3.0% | 3.9% |
| Age 18 to 20 | 5.7% | 2.1% | 4.0% |
| Age 21 to 24 | 4.5% | 8.9% | 5.2% |
| Age 25 to 34 | 4.0% | 15.3% | 13.8% |
| Age 35 to 44 | 13.1% | 8.3% | 12.9% |
| Age 45 to 54 | 15.9% | 17.1% | 12.6% |
| Age 55 to 59 | 11.9% | 5.3% | 6.7% |
| Age 60 to 64 | 8.0% | 6.5% | 6.3% |
| Age 65 to 74 | 15.9% | 4.7% | 9.6% |
| Age 75 to 84 | 6.3% | 4.7% | 4.5% |
| Age 85 and over | 5.7% | 0.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | St. Mary, MO | Chipley, FL | United States |
| White | 92.0% | 56.3% | 59.4% |
| Black | 5.1% | 31.0% | 12.2% |
| Asian | 0.0% | 0.0% | 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 | 1.1% | 2.8% | 3.2% |
| Hispanic | 1.7% | 9.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | St. Mary, MO | Chipley, FL | United States |
| Married Population | 44.2% | 39.5% | 49.8% |
| Currently Married | 43.6% | 37.1% | 48.0% |
| Married but Separated | 0.6% | 2.4% | 1.8% |
| Single Population | 55.8% | 60.5% | 50.2% |
| Never Married | 22.1% | 35.3% | 33.8% |
| Divorced | 22.7% | 16.3% | 10.8% |
| Widowed | 11.0% | 8.9% | 5.6% |
| space5 | | | |
| Household Size | 2.32 | 2.60 | 2.60 |
| Households | 76 | 1,334 | 124,010,992 |
| Family Households | 45 | 820 | 80,755,759 |
| Married couple, w/children | 17.8% | 25.7% | 30.5% |
| Married couple, no children | 53.3% | 34.6% | 42.9% |
| Non Family Households | 31 | 514 | 43,255,233 |
| Single householder, w/children | 6.7% | 24.1% | 15.8% |
| Single householder, no children | 22.2% | 15.5% | 10.8% |