| | Port Gibson, MS | Vicksburg, MS | United States |
| Population | 1,254 | 21,748 | 329,725,481 |
| Female Population | 57.6% | 51.8% | 50.5% |
| Male Population | 42.4% | 48.2% | 49.5% |
| Median Age | 42.5 | 37.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,554 | 23,873 | 309,327,143 |
| Population - 2000 | 1,840 | 26,407 | 285,036,114 |
| Population - 1990 | 1,810 | 20,908 | 251,960,433 |
| Pop. 2000 to Now | -30.1% | -19.2% | 15.6% |
| Pop. 1990 to Now | -28.9% | 2.1% | 30.8% |
| space4 | | | |
| Population Density | 713.7 | 659.4 | 93.4 |
| Land Area | 1.8 | 33.0 | 3,531,905.4 |
| Water Area | 0.0 | 2.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Port Gibson, MS | Vicksburg, MS | United States |
| Age 0 to 4 | 8.6% | 6.0% | 5.9% |
| Age 5 to 9 | 7.9% | 7.0% | 6.1% |
| Age 10 to 14 | 1.5% | 8.5% | 6.6% |
| Age 15 to 17 | 2.3% | 4.8% | 3.9% |
| Age 18 to 20 | 4.5% | 3.9% | 4.0% |
| Age 21 to 24 | 8.5% | 3.7% | 5.2% |
| Age 25 to 34 | 7.5% | 12.0% | 13.8% |
| Age 35 to 44 | 11.2% | 14.1% | 12.9% |
| Age 45 to 54 | 11.1% | 11.0% | 12.6% |
| Age 55 to 59 | 3.6% | 5.8% | 6.7% |
| Age 60 to 64 | 8.0% | 8.1% | 6.3% |
| Age 65 to 74 | 18.5% | 9.4% | 9.6% |
| Age 75 to 84 | 4.0% | 4.0% | 4.5% |
| Age 85 and over | 2.9% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Port Gibson, MS | Vicksburg, MS | United States |
| White | 13.1% | 27.0% | 59.4% |
| Black | 85.5% | 68.8% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.0% | 1.2% | 3.2% |
| Hispanic | 0.4% | 2.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Port Gibson, MS | Vicksburg, MS | United States |
| Married Population | 31.4% | 33.1% | 49.8% |
| Currently Married | 27.8% | 30.0% | 48.0% |
| Married but Separated | 3.6% | 3.1% | 1.8% |
| Single Population | 68.6% | 66.9% | 50.2% |
| Never Married | 49.1% | 46.1% | 33.8% |
| Divorced | 7.7% | 12.8% | 10.8% |
| Widowed | 11.8% | 8.1% | 5.6% |
| space5 | | | |
| Household Size | 2.51 | 2.50 | 2.60 |
| Households | 499 | 8,479 | 124,010,992 |
| Family Households | 214 | 4,597 | 80,755,759 |
| Married couple, w/children | 8.9% | 17.6% | 30.5% |
| Married couple, no children | 52.3% | 33.8% | 42.9% |
| Non Family Households | 285 | 3,882 | 43,255,233 |
| Single householder, w/children | 20.1% | 29.8% | 15.8% |
| Single householder, no children | 18.7% | 18.7% | 10.8% |