| | Gulfport, MS | Marco Island, FL | United States |
| Population | 72,468 | 15,929 | 329,725,481 |
| Female Population | 51.8% | 50.1% | 50.5% |
| Male Population | 48.2% | 49.9% | 49.5% |
| Median Age | 35.6 | 66.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 67,906 | 16,453 | 309,327,143 |
| Population - 2000 | 71,127 | 15,068 | 285,036,114 |
| Population - 1990 | 40,775 | 9,980 | 251,960,433 |
| Pop. 2000 to Now | 0.4% | 20.1% | 15.6% |
| Pop. 1990 to Now | 75.2% | 81.3% | 30.8% |
| space4 | | | |
| Population Density | 1,302.7 | 1,310.2 | 93.4 |
| Land Area | 55.6 | 12.2 | 3,531,905.4 |
| Water Area | 8.4 | 12.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Gulfport, MS | Marco Island, FL | United States |
| Age 0 to 4 | 7.1% | 1.0% | 5.9% |
| Age 5 to 9 | 6.5% | 2.1% | 6.1% |
| Age 10 to 14 | 6.5% | 2.9% | 6.6% |
| Age 15 to 17 | 3.7% | 1.5% | 3.9% |
| Age 18 to 20 | 3.5% | 0.7% | 4.0% |
| Age 21 to 24 | 5.7% | 2.0% | 5.2% |
| Age 25 to 34 | 16.2% | 3.4% | 13.8% |
| Age 35 to 44 | 12.4% | 4.2% | 12.9% |
| Age 45 to 54 | 12.3% | 8.1% | 12.6% |
| Age 55 to 59 | 6.3% | 7.4% | 6.7% |
| Age 60 to 64 | 5.9% | 9.7% | 6.3% |
| Age 65 to 74 | 7.7% | 25.6% | 9.6% |
| Age 75 to 84 | 4.2% | 23.8% | 4.5% |
| Age 85 and over | 2.0% | 7.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Gulfport, MS | Marco Island, FL | United States |
| White | 50.0% | 89.4% | 59.4% |
| Black | 39.1% | 0.4% | 12.2% |
| Asian | 1.3% | 0.8% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 3.8% | 1.1% | 3.2% |
| Hispanic | 5.4% | 8.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Gulfport, MS | Marco Island, FL | United States |
| Married Population | 41.7% | 75.5% | 49.8% |
| Currently Married | 38.6% | 74.7% | 48.0% |
| Married but Separated | 3.1% | 0.7% | 1.8% |
| Single Population | 58.3% | 24.5% | 50.2% |
| Never Married | 37.8% | 8.9% | 33.8% |
| Divorced | 14.6% | 6.7% | 10.8% |
| Widowed | 5.9% | 8.9% | 5.6% |
| space5 | | | |
| Household Size | 2.52 | 1.96 | 2.60 |
| Households | 28,064 | 8,131 | 124,010,992 |
| Family Households | 17,583 | 5,736 | 80,755,759 |
| Married couple, w/children | 22.1% | 9.3% | 30.5% |
| Married couple, no children | 33.4% | 86.1% | 42.9% |
| Non Family Households | 10,481 | 2,395 | 43,255,233 |
| Single householder, w/children | 31.4% | 1.5% | 15.8% |
| Single householder, no children | 13.0% | 3.1% | 10.8% |