| | Humboldt, TN | Sparta, TN | United States |
| Population | 7,899 | 4,981 | 329,725,481 |
| Female Population | 55.7% | 51.9% | 50.5% |
| Male Population | 44.4% | 48.1% | 49.5% |
| Median Age | 47.7 | 37.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 8,475 | 4,849 | 309,327,143 |
| Population - 2000 | 9,467 | 4,599 | 285,036,114 |
| Population - 1990 | 9,651 | 4,681 | 251,960,433 |
| Pop. 2000 to Now | -14.2% | 8.3% | 15.6% |
| Pop. 1990 to Now | -15.8% | 6.4% | 30.8% |
| space4 | | | |
| Population Density | 816.9 | 740.9 | 93.4 |
| Land Area | 9.7 | 6.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Humboldt, TN | Sparta, TN | United States |
| Age 0 to 4 | 4.6% | 5.8% | 5.9% |
| Age 5 to 9 | 5.1% | 8.2% | 6.1% |
| Age 10 to 14 | 3.1% | 6.0% | 6.6% |
| Age 15 to 17 | 2.1% | 2.8% | 3.9% |
| Age 18 to 20 | 3.9% | 4.6% | 4.0% |
| Age 21 to 24 | 3.5% | 2.6% | 5.2% |
| Age 25 to 34 | 15.6% | 16.3% | 13.8% |
| Age 35 to 44 | 9.3% | 14.7% | 12.9% |
| Age 45 to 54 | 11.8% | 7.8% | 12.6% |
| Age 55 to 59 | 5.7% | 3.7% | 6.7% |
| Age 60 to 64 | 7.6% | 5.0% | 6.3% |
| Age 65 to 74 | 15.2% | 15.4% | 9.6% |
| Age 75 to 84 | 8.3% | 4.7% | 4.5% |
| Age 85 and over | 4.4% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Humboldt, TN | Sparta, TN | United States |
| White | 57.1% | 84.4% | 59.4% |
| Black | 37.1% | 5.2% | 12.2% |
| Asian | 0.0% | 0.8% | 5.6% |
| Native American | 0.7% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.2% | 3.1% | 3.2% |
| Hispanic | 4.0% | 6.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Humboldt, TN | Sparta, TN | United States |
| Married Population | 43.6% | 53.6% | 49.8% |
| Currently Married | 41.3% | 50.0% | 48.0% |
| Married but Separated | 2.3% | 3.5% | 1.8% |
| Single Population | 56.4% | 46.4% | 50.2% |
| Never Married | 36.7% | 23.6% | 33.8% |
| Divorced | 11.1% | 10.9% | 10.8% |
| Widowed | 8.6% | 11.9% | 5.6% |
| space5 | | | |
| Household Size | 2.20 | 2.48 | 2.60 |
| Households | 3,464 | 1,866 | 124,010,992 |
| Family Households | 1,958 | 1,228 | 80,755,759 |
| Married couple, w/children | 14.2% | 28.3% | 30.5% |
| Married couple, no children | 47.4% | 40.9% | 42.9% |
| Non Family Households | 1,506 | 638 | 43,255,233 |
| Single householder, w/children | 17.2% | 15.7% | 15.8% |
| Single householder, no children | 21.1% | 15.1% | 10.8% |