| | Flat Rock, NC | Jupiter, FL | United States |
| Population | 3,460 | 60,629 | 329,725,481 |
| Female Population | 52.3% | 51.8% | 50.5% |
| Male Population | 47.7% | 48.2% | 49.5% |
| Median Age | 63.1 | 45.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,119 | 55,379 | 309,327,143 |
| Population - 2000 | 2,565 | 39,328 | 285,036,114 |
| Population - 1990 | 1,940 | 24,986 | 251,960,433 |
| Pop. 2000 to Now | 32.9% | 67.4% | 15.6% |
| Pop. 1990 to Now | 75.7% | 163.5% | 30.8% |
| space4 | | | |
| Population Density | 427.1 | 2,806.0 | 93.4 |
| Land Area | 8.1 | 21.6 | 3,531,905.4 |
| Water Area | 0.1 | 1.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Flat Rock, NC | Jupiter, FL | United States |
| Age 0 to 4 | 2.1% | 4.3% | 5.9% |
| Age 5 to 9 | 2.9% | 4.8% | 6.1% |
| Age 10 to 14 | 4.1% | 7.0% | 6.6% |
| Age 15 to 17 | 0.8% | 3.4% | 3.9% |
| Age 18 to 20 | 1.4% | 3.1% | 4.0% |
| Age 21 to 24 | 1.6% | 4.0% | 5.2% |
| Age 25 to 34 | 5.1% | 10.5% | 13.8% |
| Age 35 to 44 | 6.3% | 11.9% | 12.9% |
| Age 45 to 54 | 9.0% | 13.5% | 12.6% |
| Age 55 to 59 | 9.4% | 7.7% | 6.7% |
| Age 60 to 64 | 8.7% | 7.1% | 6.3% |
| Age 65 to 74 | 27.6% | 12.4% | 9.6% |
| Age 75 to 84 | 17.7% | 7.9% | 4.5% |
| Age 85 and over | 3.3% | 2.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Flat Rock, NC | Jupiter, FL | United States |
| White | 94.3% | 76.5% | 59.4% |
| Black | 0.0% | 1.2% | 12.2% |
| Asian | 0.0% | 1.8% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 0.5% | 3.8% | 3.2% |
| Hispanic | 5.2% | 16.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Flat Rock, NC | Jupiter, FL | United States |
| Married Population | 72.9% | 53.9% | 49.8% |
| Currently Married | 70.8% | 52.7% | 48.0% |
| Married but Separated | 2.2% | 1.2% | 1.8% |
| Single Population | 27.1% | 46.1% | 50.2% |
| Never Married | 11.6% | 26.6% | 33.8% |
| Divorced | 10.6% | 12.5% | 10.8% |
| Widowed | 5.0% | 7.0% | 5.6% |
| space5 | | | |
| Household Size | 2.07 | 2.42 | 2.60 |
| Households | 1,672 | 24,825 | 124,010,992 |
| Family Households | 1,140 | 15,723 | 80,755,759 |
| Married couple, w/children | 10.9% | 29.9% | 30.5% |
| Married couple, no children | 85.8% | 51.0% | 42.9% |
| Non Family Households | 532 | 9,102 | 43,255,233 |
| Single householder, w/children | 0.6% | 11.0% | 15.8% |
| Single householder, no children | 2.7% | 8.1% | 10.8% |