| | Green Cove Springs, FL | Penney Farms, FL | United States |
| Population | 9,351 | 680 | 329,725,481 |
| Female Population | 48.2% | 54.9% | 50.5% |
| Male Population | 51.8% | 45.2% | 49.5% |
| Median Age | 40.5 | 75.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,939 | 751 | 309,327,143 |
| Population - 2000 | 5,378 | 580 | 285,036,114 |
| Population - 1990 | 4,497 | 609 | 251,960,433 |
| Pop. 2000 to Now | 65.9% | 44.7% | 15.6% |
| Pop. 1990 to Now | 98.4% | 37.8% | 30.8% |
| space4 | | | |
| Population Density | 1,241.7 | 464.2 | 93.4 |
| Land Area | 7.5 | 1.5 | 3,531,905.4 |
| Water Area | 2.7 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Green Cove Springs, FL | Penney Farms, FL | United States |
| Age 0 to 4 | 4.4% | 2.5% | 5.9% |
| Age 5 to 9 | 6.6% | 0.0% | 6.1% |
| Age 10 to 14 | 5.2% | 5.0% | 6.6% |
| Age 15 to 17 | 2.7% | 7.1% | 3.9% |
| Age 18 to 20 | 3.2% | 0.0% | 4.0% |
| Age 21 to 24 | 6.0% | 0.0% | 5.2% |
| Age 25 to 34 | 14.3% | 2.6% | 13.8% |
| Age 35 to 44 | 13.5% | 9.3% | 12.9% |
| Age 45 to 54 | 11.0% | 2.1% | 12.6% |
| Age 55 to 59 | 5.9% | 2.6% | 6.7% |
| Age 60 to 64 | 7.4% | 1.0% | 6.3% |
| Age 65 to 74 | 10.9% | 15.3% | 9.6% |
| Age 75 to 84 | 7.5% | 30.0% | 4.5% |
| Age 85 and over | 1.4% | 22.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Green Cove Springs, FL | Penney Farms, FL | United States |
| White | 67.2% | 94.3% | 59.4% |
| Black | 11.1% | 5.0% | 12.2% |
| Asian | 0.9% | 0.0% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.4% | 0.0% | 0.4% |
| Two or More Races | 4.5% | 0.0% | 3.2% |
| Hispanic | 14.9% | 0.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Green Cove Springs, FL | Penney Farms, FL | United States |
| Married Population | 46.6% | 57.1% | 49.8% |
| Currently Married | 43.6% | 52.1% | 48.0% |
| Married but Separated | 2.9% | 4.9% | 1.8% |
| Single Population | 53.4% | 42.9% | 50.2% |
| Never Married | 28.7% | 17.5% | 33.8% |
| Divorced | 17.5% | 7.6% | 10.8% |
| Widowed | 7.2% | 17.8% | 5.6% |
| space5 | | | |
| Household Size | 2.66 | 2.03 | 2.60 |
| Households | 3,338 | 275 | 124,010,992 |
| Family Households | 2,313 | 163 | 80,755,759 |
| Married couple, w/children | 24.8% | 10.4% | 30.5% |
| Married couple, no children | 46.0% | 77.3% | 42.9% |
| Non Family Households | 1,025 | 112 | 43,255,233 |
| Single householder, w/children | 20.8% | 1.2% | 15.8% |
| Single householder, no children | 8.5% | 11.0% | 10.8% |