| | Southport, NC | Rotonda, FL | United States |
| Population | 3,842 | 9,906 | 329,725,481 |
| Female Population | 60.6% | 54.8% | 50.5% |
| Male Population | 39.4% | 45.2% | 49.5% |
| Median Age | 63.2 | 68.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,934 | 9,539 | 309,327,143 |
| Population - 2000 | 2,351 | 6,574 | 285,036,114 |
| Population - 1990 | 2,369 | 3,576 | 251,960,433 |
| Pop. 2000 to Now | 73.9% | 54.1% | 15.6% |
| Pop. 1990 to Now | 72.6% | 183.3% | 30.8% |
| space4 | | | |
| Population Density | 971.9 | 929.5 | 93.4 |
| Land Area | 4.0 | 10.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.9 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Southport, NC | Rotonda, FL | United States |
| Age 0 to 4 | 3.2% | 1.1% | 5.9% |
| Age 5 to 9 | 4.0% | 1.9% | 6.1% |
| Age 10 to 14 | 3.2% | 1.6% | 6.6% |
| Age 15 to 17 | 1.7% | 1.6% | 3.9% |
| Age 18 to 20 | 2.6% | 0.6% | 4.0% |
| Age 21 to 24 | 1.4% | 0.9% | 5.2% |
| Age 25 to 34 | 5.7% | 4.7% | 13.8% |
| Age 35 to 44 | 7.3% | 3.1% | 12.9% |
| Age 45 to 54 | 10.2% | 9.2% | 12.6% |
| Age 55 to 59 | 6.2% | 7.5% | 6.7% |
| Age 60 to 64 | 11.4% | 9.8% | 6.3% |
| Age 65 to 74 | 30.3% | 29.0% | 9.6% |
| Age 75 to 84 | 7.9% | 23.5% | 4.5% |
| Age 85 and over | 5.1% | 5.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Southport, NC | Rotonda, FL | United States |
| White | 84.5% | 94.9% | 59.4% |
| Black | 12.2% | 0.7% | 12.2% |
| Asian | 0.0% | 1.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.0% | 1.9% | 3.2% |
| Hispanic | 2.3% | 1.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Southport, NC | Rotonda, FL | United States |
| Married Population | 64.9% | 64.9% | 49.8% |
| Currently Married | 63.2% | 64.1% | 48.0% |
| Married but Separated | 1.7% | 0.8% | 1.8% |
| Single Population | 35.1% | 35.1% | 50.2% |
| Never Married | 15.6% | 9.7% | 33.8% |
| Divorced | 11.7% | 12.8% | 10.8% |
| Widowed | 7.7% | 12.6% | 5.6% |
| space5 | | | |
| Household Size | 2.12 | 1.88 | 2.60 |
| Households | 1,739 | 5,277 | 124,010,992 |
| Family Households | 1,248 | 3,174 | 80,755,759 |
| Married couple, w/children | 12.7% | 10.1% | 30.5% |
| Married couple, no children | 69.8% | 80.5% | 42.9% |
| Non Family Households | 491 | 2,103 | 43,255,233 |
| Single householder, w/children | 9.9% | 2.4% | 15.8% |
| Single householder, no children | 7.5% | 7.1% | 10.8% |