| | Decatur, MS | Hickory, MS | United States |
| Population | 1,808 | 589 | 329,725,481 |
| Female Population | 54.0% | 55.5% | 50.5% |
| Male Population | 46.0% | 44.5% | 49.5% |
| Median Age | 23.8 | 29 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,838 | 528 | 309,327,143 |
| Population - 2000 | 1,426 | 499 | 285,036,114 |
| Population - 1990 | 1,248 | 493 | 251,960,433 |
| Pop. 2000 to Now | 21.5% | 3.2% | 15.6% |
| Pop. 1990 to Now | 38.9% | 4.5% | 30.8% |
| space4 | | | |
| Population Density | 327.9 | 629.3 | 93.4 |
| Land Area | 5.5 | 0.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Decatur, MS | Hickory, MS | United States |
| Age 0 to 4 | 4.8% | 7.1% | 5.9% |
| Age 5 to 9 | 2.7% | 15.6% | 6.1% |
| Age 10 to 14 | 5.9% | 11.7% | 6.6% |
| Age 15 to 17 | 2.7% | 7.5% | 3.9% |
| Age 18 to 20 | 28.3% | 2.9% | 4.0% |
| Age 21 to 24 | 6.0% | 2.7% | 5.2% |
| Age 25 to 34 | 13.3% | 5.6% | 13.8% |
| Age 35 to 44 | 6.4% | 22.9% | 12.9% |
| Age 45 to 54 | 10.4% | 7.1% | 12.6% |
| Age 55 to 59 | 1.6% | 7.1% | 6.7% |
| Age 60 to 64 | 5.5% | 3.7% | 6.3% |
| Age 65 to 74 | 6.0% | 2.9% | 9.6% |
| Age 75 to 84 | 6.1% | 3.1% | 4.5% |
| Age 85 and over | 0.3% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Decatur, MS | Hickory, MS | United States |
| White | 56.6% | 29.4% | 59.4% |
| Black | 40.4% | 66.9% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 1.4% | 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% | 3.4% | 3.2% |
| Hispanic | 0.6% | 0.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Decatur, MS | Hickory, MS | United States |
| Married Population | 25.4% | 52.3% | 49.8% |
| Currently Married | 25.4% | 52.3% | 48.0% |
| Married but Separated | 0.0% | 0.0% | 1.8% |
| Single Population | 74.6% | 47.7% | 50.2% |
| Never Married | 58.4% | 37.0% | 33.8% |
| Divorced | 12.6% | 6.7% | 10.8% |
| Widowed | 3.6% | 3.9% | 5.6% |
| space5 | | | |
| Household Size | 2.56 | 3.24 | 2.60 |
| Households | 494 | 182 | 124,010,992 |
| Family Households | 274 | 148 | 80,755,759 |
| Married couple, w/children | 16.1% | 39.9% | 30.5% |
| Married couple, no children | 46.4% | 27.0% | 42.9% |
| Non Family Households | 220 | 34 | 43,255,233 |
| Single householder, w/children | 24.1% | 27.7% | 15.8% |
| Single householder, no children | 13.5% | 5.4% | 10.8% |