| | Moss Point, MS | Theodore, AL | United States |
| Population | 12,282 | 5,949 | 329,725,481 |
| Female Population | 51.3% | 53.4% | 50.5% |
| Male Population | 48.7% | 46.6% | 49.5% |
| Median Age | 41.7 | 36.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 13,671 | 6,147 | 309,327,143 |
| Population - 2000 | 15,851 | 6,811 | 285,036,114 |
| Population - 1990 | 17,837 | 6,509 | 251,960,433 |
| Pop. 2000 to Now | -16.6% | -4.5% | 15.6% |
| Pop. 1990 to Now | -25.9% | -0.1% | 30.8% |
| space4 | | | |
| Population Density | 509.1 | 744.3 | 93.4 |
| Land Area | 24.1 | 8.0 | 3,531,905.4 |
| Water Area | 2.5 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Moss Point, MS | Theodore, AL | United States |
| Age 0 to 4 | 7.3% | 9.1% | 5.9% |
| Age 5 to 9 | 5.1% | 8.0% | 6.1% |
| Age 10 to 14 | 4.7% | 7.6% | 6.6% |
| Age 15 to 17 | 4.6% | 4.1% | 3.9% |
| Age 18 to 20 | 3.3% | 1.3% | 4.0% |
| Age 21 to 24 | 4.8% | 2.9% | 5.2% |
| Age 25 to 34 | 10.3% | 16.4% | 13.8% |
| Age 35 to 44 | 14.2% | 11.5% | 12.9% |
| Age 45 to 54 | 12.1% | 12.4% | 12.6% |
| Age 55 to 59 | 5.6% | 6.7% | 6.7% |
| Age 60 to 64 | 9.0% | 8.3% | 6.3% |
| Age 65 to 74 | 12.3% | 7.8% | 9.6% |
| Age 75 to 84 | 5.3% | 3.1% | 4.5% |
| Age 85 and over | 1.3% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Moss Point, MS | Theodore, AL | United States |
| White | 17.6% | 71.2% | 59.4% |
| Black | 75.4% | 19.0% | 12.2% |
| Asian | 0.1% | 5.2% | 5.6% |
| Native American | 0.0% | 0.7% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 2.4% | 0.0% | 0.4% |
| Two or More Races | 1.1% | 1.4% | 3.2% |
| Hispanic | 3.4% | 2.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Moss Point, MS | Theodore, AL | United States |
| Married Population | 33.7% | 47.2% | 49.8% |
| Currently Married | 31.3% | 45.4% | 48.0% |
| Married but Separated | 2.4% | 1.8% | 1.8% |
| Single Population | 66.3% | 52.8% | 50.2% |
| Never Married | 44.5% | 30.9% | 33.8% |
| Divorced | 10.7% | 15.5% | 10.8% |
| Widowed | 11.0% | 6.4% | 5.6% |
| space5 | | | |
| Household Size | 2.62 | 2.78 | 2.60 |
| Households | 4,644 | 2,142 | 124,010,992 |
| Family Households | 2,910 | 1,422 | 80,755,759 |
| Married couple, w/children | 13.1% | 31.7% | 30.5% |
| Married couple, no children | 37.5% | 35.4% | 42.9% |
| Non Family Households | 1,734 | 720 | 43,255,233 |
| Single householder, w/children | 24.7% | 23.3% | 15.8% |
| Single householder, no children | 24.7% | 9.6% | 10.8% |