| | Monticello, FL | Lake City, FL | United States |
| Population | 2,539 | 12,325 | 329,725,481 |
| Female Population | 61.7% | 51.6% | 50.5% |
| Male Population | 38.3% | 48.5% | 49.5% |
| Median Age | 53.5 | 35.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,519 | 11,898 | 309,327,143 |
| Population - 2000 | 2,533 | 9,980 | 285,036,114 |
| Population - 1990 | 2,573 | 10,005 | 251,960,433 |
| Pop. 2000 to Now | -3.2% | 24.5% | 15.6% |
| Pop. 1990 to Now | -4.7% | 24.2% | 30.8% |
| space4 | | | |
| Population Density | 632.9 | 1,040.3 | 93.4 |
| Land Area | 4.0 | 11.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Monticello, FL | Lake City, FL | United States |
| Age 0 to 4 | 7.4% | 10.6% | 5.9% |
| Age 5 to 9 | 7.0% | 7.8% | 6.1% |
| Age 10 to 14 | 3.7% | 6.1% | 6.6% |
| Age 15 to 17 | 1.9% | 3.3% | 3.9% |
| Age 18 to 20 | 2.0% | 4.1% | 4.0% |
| Age 21 to 24 | 4.1% | 3.6% | 5.2% |
| Age 25 to 34 | 8.7% | 12.8% | 13.8% |
| Age 35 to 44 | 8.9% | 13.0% | 12.9% |
| Age 45 to 54 | 8.5% | 10.7% | 12.6% |
| Age 55 to 59 | 8.2% | 6.3% | 6.7% |
| Age 60 to 64 | 8.4% | 5.2% | 6.3% |
| Age 65 to 74 | 18.0% | 8.9% | 9.6% |
| Age 75 to 84 | 8.3% | 5.3% | 4.5% |
| Age 85 and over | 5.0% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Monticello, FL | Lake City, FL | United States |
| White | 47.0% | 54.8% | 59.4% |
| Black | 51.3% | 31.9% | 12.2% |
| Asian | 0.0% | 1.4% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.7% | 0.4% |
| Two or More Races | 0.6% | 6.0% | 3.2% |
| Hispanic | 1.0% | 4.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Monticello, FL | Lake City, FL | United States |
| Married Population | 41.7% | 40.6% | 49.8% |
| Currently Married | 41.1% | 38.3% | 48.0% |
| Married but Separated | 0.6% | 2.3% | 1.8% |
| Single Population | 58.3% | 59.4% | 50.2% |
| Never Married | 32.1% | 34.9% | 33.8% |
| Divorced | 12.6% | 17.8% | 10.8% |
| Widowed | 13.6% | 6.6% | 5.6% |
| space5 | | | |
| Household Size | 2.07 | 2.43 | 2.60 |
| Households | 1,192 | 4,813 | 124,010,992 |
| Family Households | 720 | 2,521 | 80,755,759 |
| Married couple, w/children | 15.4% | 30.1% | 30.5% |
| Married couple, no children | 41.1% | 30.3% | 42.9% |
| Non Family Households | 472 | 2,292 | 43,255,233 |
| Single householder, w/children | 12.4% | 24.8% | 15.8% |
| Single householder, no children | 31.1% | 14.8% | 10.8% |