| | Columbus, MS | Hammond, LA | United States |
| Population | 23,858 | 19,374 | 329,725,481 |
| Female Population | 54.6% | 52.4% | 50.5% |
| Male Population | 45.4% | 47.6% | 49.5% |
| Median Age | 39.9 | 27.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 25,217 | 19,603 | 309,327,143 |
| Population - 2000 | 25,944 | 17,639 | 285,036,114 |
| Population - 1990 | 23,799 | 15,871 | 251,960,433 |
| Pop. 2000 to Now | -10.2% | 21.1% | 15.6% |
| Pop. 1990 to Now | -2.1% | 34.6% | 30.8% |
| space4 | | | |
| Population Density | 953.3 | 1,381.4 | 93.4 |
| Land Area | 25.0 | 14.0 | 3,531,905.4 |
| Water Area | 0.8 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Columbus, MS | Hammond, LA | United States |
| Age 0 to 4 | 4.8% | 5.1% | 5.9% |
| Age 5 to 9 | 4.6% | 5.8% | 6.1% |
| Age 10 to 14 | 7.9% | 7.5% | 6.6% |
| Age 15 to 17 | 3.4% | 3.9% | 3.9% |
| Age 18 to 20 | 4.7% | 13.2% | 4.0% |
| Age 21 to 24 | 5.9% | 10.3% | 5.2% |
| Age 25 to 34 | 14.8% | 13.9% | 13.8% |
| Age 35 to 44 | 9.0% | 11.1% | 12.9% |
| Age 45 to 54 | 11.8% | 6.6% | 12.6% |
| Age 55 to 59 | 6.7% | 4.7% | 6.7% |
| Age 60 to 64 | 7.5% | 5.4% | 6.3% |
| Age 65 to 74 | 10.8% | 7.2% | 9.6% |
| Age 75 to 84 | 6.1% | 4.5% | 4.5% |
| Age 85 and over | 2.0% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Columbus, MS | Hammond, LA | United States |
| White | 34.8% | 46.7% | 59.4% |
| Black | 61.0% | 44.2% | 12.2% |
| Asian | 0.6% | 1.7% | 5.6% |
| Native American | 0.1% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.5% | 0.2% | 0.4% |
| Two or More Races | 1.7% | 0.6% | 3.2% |
| Hispanic | 1.4% | 6.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Columbus, MS | Hammond, LA | United States |
| Married Population | 35.4% | 28.7% | 49.8% |
| Currently Married | 32.3% | 26.1% | 48.0% |
| Married but Separated | 3.2% | 2.6% | 1.8% |
| Single Population | 64.6% | 71.3% | 50.2% |
| Never Married | 43.5% | 54.7% | 33.8% |
| Divorced | 12.6% | 10.7% | 10.8% |
| Widowed | 8.5% | 5.9% | 5.6% |
| space5 | | | |
| Household Size | 2.28 | 2.56 | 2.60 |
| Households | 9,843 | 6,497 | 124,010,992 |
| Family Households | 5,263 | 3,581 | 80,755,759 |
| Married couple, w/children | 12.4% | 19.9% | 30.5% |
| Married couple, no children | 42.0% | 32.3% | 42.9% |
| Non Family Households | 4,580 | 2,916 | 43,255,233 |
| Single householder, w/children | 29.6% | 33.3% | 15.8% |
| Single householder, no children | 16.0% | 14.5% | 10.8% |