| | North Port, FL | Fleming Island, FL | United States |
| Population | 74,131 | 29,505 | 329,725,481 |
| Female Population | 52.3% | 51.5% | 50.5% |
| Male Population | 47.7% | 48.5% | 49.5% |
| Median Age | 48.5 | 46.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 57,392 | 27,908 | 309,327,143 |
| Population - 2000 | 22,797 | 14,830 | 285,036,114 |
| Population - 1990 | 11,973 | 5,528 | 251,960,433 |
| Pop. 2000 to Now | 223.5% | 115.3% | 15.6% |
| Pop. 1990 to Now | 515.9% | 477.6% | 30.8% |
| space4 | | | |
| Population Density | 744.9 | 1,862.9 | 93.4 |
| Land Area | 99.5 | 15.8 | 3,531,905.4 |
| Water Area | 4.6 | 7.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | North Port, FL | Fleming Island, FL | United States |
| Age 0 to 4 | 4.7% | 3.7% | 5.9% |
| Age 5 to 9 | 5.1% | 5.9% | 6.1% |
| Age 10 to 14 | 5.4% | 5.6% | 6.6% |
| Age 15 to 17 | 3.4% | 4.7% | 3.9% |
| Age 18 to 20 | 4.3% | 4.7% | 4.0% |
| Age 21 to 24 | 4.5% | 3.7% | 5.2% |
| Age 25 to 34 | 9.0% | 8.1% | 13.8% |
| Age 35 to 44 | 8.5% | 12.2% | 12.9% |
| Age 45 to 54 | 12.9% | 15.9% | 12.6% |
| Age 55 to 59 | 8.2% | 8.0% | 6.7% |
| Age 60 to 64 | 6.9% | 7.6% | 6.3% |
| Age 65 to 74 | 17.0% | 12.6% | 9.6% |
| Age 75 to 84 | 8.0% | 5.8% | 4.5% |
| Age 85 and over | 2.1% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | North Port, FL | Fleming Island, FL | United States |
| White | 79.0% | 78.7% | 59.4% |
| Black | 5.4% | 5.1% | 12.2% |
| Asian | 1.9% | 2.4% | 5.6% |
| Native American | 0.1% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.5% | 0.4% |
| Two or More Races | 2.9% | 3.4% | 3.2% |
| Hispanic | 10.8% | 9.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | North Port, FL | Fleming Island, FL | United States |
| Married Population | 57.2% | 66.7% | 49.8% |
| Currently Married | 56.2% | 66.3% | 48.0% |
| Married but Separated | 0.9% | 0.4% | 1.8% |
| Single Population | 42.8% | 33.3% | 50.2% |
| Never Married | 23.4% | 20.9% | 33.8% |
| Divorced | 14.3% | 8.2% | 10.8% |
| Widowed | 5.2% | 4.2% | 5.6% |
| space5 | | | |
| Household Size | 2.62 | 2.66 | 2.60 |
| Households | 28,209 | 11,090 | 124,010,992 |
| Family Households | 21,424 | 8,957 | 80,755,759 |
| Married couple, w/children | 19.6% | 33.0% | 30.5% |
| Married couple, no children | 57.5% | 55.3% | 42.9% |
| Non Family Households | 6,785 | 2,133 | 43,255,233 |
| Single householder, w/children | 14.6% | 6.7% | 15.8% |
| Single householder, no children | 8.3% | 5.0% | 10.8% |