| | McCool, MS | Liberty, MS | United States |
| Population | 112 | 833 | 329,725,481 |
| Female Population | 55.4% | 52.5% | 50.5% |
| Male Population | 44.6% | 47.5% | 49.5% |
| Median Age | 40.3 | 43.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 133 | 700 | 309,327,143 |
| Population - 2000 | 182 | 633 | 285,036,114 |
| Population - 1990 | 169 | 624 | 251,960,433 |
| Pop. 2000 to Now | -32.4% | 0.2% | 15.6% |
| Pop. 1990 to Now | -27.2% | 1.6% | 30.8% |
| space4 | | | |
| Population Density | 119.3 | 404.2 | 93.4 |
| Land Area | 0.9 | 2.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | McCool, MS | Liberty, MS | United States |
| Age 0 to 4 | 3.6% | 5.4% | 5.9% |
| Age 5 to 9 | 6.3% | 4.3% | 6.1% |
| Age 10 to 14 | 12.5% | 7.6% | 6.6% |
| Age 15 to 17 | 8.0% | 8.9% | 3.9% |
| Age 18 to 20 | 4.5% | 0.2% | 4.0% |
| Age 21 to 24 | 0.0% | 1.2% | 5.2% |
| Age 25 to 34 | 8.0% | 9.8% | 13.8% |
| Age 35 to 44 | 11.6% | 12.8% | 12.9% |
| Age 45 to 54 | 9.8% | 16.1% | 12.6% |
| Age 55 to 59 | 2.7% | 1.3% | 6.7% |
| Age 60 to 64 | 8.0% | 4.4% | 6.3% |
| Age 65 to 74 | 14.3% | 13.0% | 9.6% |
| Age 75 to 84 | 7.1% | 8.2% | 4.5% |
| Age 85 and over | 3.6% | 6.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | McCool, MS | Liberty, MS | United States |
| White | 100.0% | 63.1% | 59.4% |
| Black | 0.0% | 31.2% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 5.3% | 3.2% |
| Hispanic | 0.0% | 0.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | McCool, MS | Liberty, MS | United States |
| Married Population | 34.5% | 45.3% | 49.8% |
| Currently Married | 34.5% | 42.1% | 48.0% |
| Married but Separated | 0.0% | 3.2% | 1.8% |
| Single Population | 65.5% | 54.7% | 50.2% |
| Never Married | 25.3% | 29.0% | 33.8% |
| Divorced | 26.4% | 14.8% | 10.8% |
| Widowed | 13.8% | 10.9% | 5.6% |
| space5 | | | |
| Household Size | 2.60 | 2.29 | 2.60 |
| Households | 43 | 322 | 124,010,992 |
| Family Households | 26 | 178 | 80,755,759 |
| Married couple, w/children | 34.6% | 42.1% | 30.5% |
| Married couple, no children | 26.9% | 33.1% | 42.9% |
| Non Family Households | 17 | 144 | 43,255,233 |
| Single householder, w/children | 23.1% | 15.2% | 15.8% |
| Single householder, no children | 15.4% | 9.6% | 10.8% |