| | Greenville, FL | Monticello, FL | United States |
| Population | 1,206 | 2,539 | 329,725,481 |
| Female Population | 54.1% | 61.7% | 50.5% |
| Male Population | 45.9% | 38.3% | 49.5% |
| Median Age | 30.3 | 53.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 861 | 2,519 | 309,327,143 |
| Population - 2000 | 837 | 2,533 | 285,036,114 |
| Population - 1990 | 950 | 2,573 | 251,960,433 |
| Pop. 2000 to Now | -0.7% | -3.2% | 15.6% |
| Pop. 1990 to Now | -12.5% | -4.7% | 30.8% |
| space4 | | | |
| Population Density | 915.7 | 632.9 | 93.4 |
| Land Area | 1.3 | 4.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Greenville, FL | Monticello, FL | United States |
| Age 0 to 4 | 11.0% | 7.4% | 5.9% |
| Age 5 to 9 | 3.9% | 7.0% | 6.1% |
| Age 10 to 14 | 12.2% | 3.7% | 6.6% |
| Age 15 to 17 | 0.7% | 1.9% | 3.9% |
| Age 18 to 20 | 2.7% | 2.0% | 4.0% |
| Age 21 to 24 | 4.6% | 4.1% | 5.2% |
| Age 25 to 34 | 30.5% | 8.7% | 13.8% |
| Age 35 to 44 | 5.0% | 8.9% | 12.9% |
| Age 45 to 54 | 6.1% | 8.5% | 12.6% |
| Age 55 to 59 | 8.4% | 8.2% | 6.7% |
| Age 60 to 64 | 5.6% | 8.4% | 6.3% |
| Age 65 to 74 | 7.0% | 18.0% | 9.6% |
| Age 75 to 84 | 1.5% | 8.3% | 4.5% |
| Age 85 and over | 0.8% | 5.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Greenville, FL | Monticello, FL | United States |
| White | 6.1% | 47.0% | 59.4% |
| Black | 88.6% | 51.3% | 12.2% |
| Asian | 0.2% | 0.0% | 5.6% |
| Native American | 0.2% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 5.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 0.6% | 3.2% |
| Hispanic | 0.0% | 1.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Greenville, FL | Monticello, FL | United States |
| Married Population | 13.8% | 41.7% | 49.8% |
| Currently Married | 13.2% | 41.1% | 48.0% |
| Married but Separated | 0.6% | 0.6% | 1.8% |
| Single Population | 86.2% | 58.3% | 50.2% |
| Never Married | 70.9% | 32.1% | 33.8% |
| Divorced | 8.0% | 12.6% | 10.8% |
| Widowed | 7.4% | 13.6% | 5.6% |
| space5 | | | |
| Household Size | 3.76 | 2.07 | 2.60 |
| Households | 309 | 1,192 | 124,010,992 |
| Family Households | 192 | 720 | 80,755,759 |
| Married couple, w/children | 4.2% | 15.4% | 30.5% |
| Married couple, no children | 17.2% | 41.1% | 42.9% |
| Non Family Households | 117 | 472 | 43,255,233 |
| Single householder, w/children | 61.5% | 12.4% | 15.8% |
| Single householder, no children | 17.2% | 31.1% | 10.8% |