| | Surfside Beach, SC | St. Pete Beach, FL | United States |
| Population | 4,155 | 8,963 | 329,725,481 |
| Female Population | 46.8% | 46.3% | 50.5% |
| Male Population | 53.2% | 53.7% | 49.5% |
| Median Age | 51.5 | 61.2 | 38.4 |
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| Population - 2010 | 3,842 | 9,334 | 309,327,143 |
| Population - 2000 | 4,425 | 9,929 | 285,036,114 |
| Population - 1990 | 3,845 | 9,514 | 251,960,433 |
| Pop. 2000 to Now | 3.5% | -4.0% | 15.6% |
| Pop. 1990 to Now | 19.1% | 0.2% | 30.8% |
| space4 | | | |
| Population Density | 2,150.6 | 4,215.9 | 93.4 |
| Land Area | 1.9 | 2.1 | 3,531,905.4 |
| Water Area | 0.0 | 4.8 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Surfside Beach, SC | St. Pete Beach, FL | United States |
| Age 0 to 4 | 4.2% | 0.8% | 5.9% |
| Age 5 to 9 | 1.1% | 0.5% | 6.1% |
| Age 10 to 14 | 3.2% | 3.6% | 6.6% |
| Age 15 to 17 | 3.7% | 1.7% | 3.9% |
| Age 18 to 20 | 1.5% | 3.0% | 4.0% |
| Age 21 to 24 | 3.2% | 1.9% | 5.2% |
| Age 25 to 34 | 10.5% | 5.2% | 13.8% |
| Age 35 to 44 | 10.6% | 4.3% | 12.9% |
| Age 45 to 54 | 17.2% | 16.1% | 12.6% |
| Age 55 to 59 | 7.4% | 8.9% | 6.7% |
| Age 60 to 64 | 11.0% | 15.3% | 6.3% |
| Age 65 to 74 | 17.1% | 17.0% | 9.6% |
| Age 75 to 84 | 7.9% | 12.8% | 4.5% |
| Age 85 and over | 1.4% | 8.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Surfside Beach, SC | St. Pete Beach, FL | United States |
| White | 93.8% | 91.5% | 59.4% |
| Black | 1.2% | 0.3% | 12.2% |
| Asian | 0.7% | 1.6% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 3.7% | 2.4% | 3.2% |
| Hispanic | 0.5% | 3.9% | 18.4% |
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| Marriage & Family | | | |
| | Surfside Beach, SC | St. Pete Beach, FL | United States |
| Married Population | 54.8% | 59.5% | 49.8% |
| Currently Married | 51.9% | 58.8% | 48.0% |
| Married but Separated | 2.9% | 0.7% | 1.8% |
| Single Population | 45.2% | 40.5% | 50.2% |
| Never Married | 22.9% | 17.1% | 33.8% |
| Divorced | 15.7% | 16.6% | 10.8% |
| Widowed | 6.6% | 6.8% | 5.6% |
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| Household Size | 2.31 | 1.93 | 2.60 |
| Households | 1,802 | 4,630 | 124,010,992 |
| Family Households | 1,166 | 2,751 | 80,755,759 |
| Married couple, w/children | 14.5% | 11.5% | 30.5% |
| Married couple, no children | 61.8% | 79.3% | 42.9% |
| Non Family Households | 636 | 1,879 | 43,255,233 |
| Single householder, w/children | 14.5% | 2.4% | 15.8% |
| Single householder, no children | 9.2% | 6.8% | 10.8% |