| | Coalfield, TN | Harriman, TN | United States |
| Population | 2,939 | 5,936 | 329,725,481 |
| Female Population | 45.9% | 51.2% | 50.5% |
| Male Population | 54.1% | 48.9% | 49.5% |
| Median Age | 36 | 43.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,919 | 6,337 | 309,327,143 |
| Population - 2000 | 2,292 | 6,744 | 285,036,114 |
| Population - 1990 | 2,421 | 7,119 | 251,960,433 |
| Pop. 2000 to Now | 11.6% | -8.3% | 15.6% |
| Pop. 1990 to Now | 5.6% | -13.2% | 30.8% |
| space4 | | | |
| Population Density | 118.8 | 565.8 | 93.4 |
| Land Area | 24.7 | 10.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Coalfield, TN | Harriman, TN | United States |
| Age 0 to 4 | 7.2% | 4.5% | 5.9% |
| Age 5 to 9 | 9.9% | 3.4% | 6.1% |
| Age 10 to 14 | 9.1% | 7.4% | 6.6% |
| Age 15 to 17 | 5.1% | 2.8% | 3.9% |
| Age 18 to 20 | 0.6% | 2.4% | 4.0% |
| Age 21 to 24 | 6.2% | 5.9% | 5.2% |
| Age 25 to 34 | 9.5% | 14.4% | 13.8% |
| Age 35 to 44 | 12.1% | 10.8% | 12.9% |
| Age 45 to 54 | 12.9% | 16.7% | 12.6% |
| Age 55 to 59 | 2.2% | 5.0% | 6.7% |
| Age 60 to 64 | 5.1% | 11.6% | 6.3% |
| Age 65 to 74 | 11.2% | 8.7% | 9.6% |
| Age 75 to 84 | 7.9% | 4.8% | 4.5% |
| Age 85 and over | 1.0% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Coalfield, TN | Harriman, TN | United States |
| White | 98.2% | 91.7% | 59.4% |
| Black | 0.0% | 6.4% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 0.0% | 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% | 0.4% | 3.2% |
| Hispanic | 0.6% | 1.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Coalfield, TN | Harriman, TN | United States |
| Married Population | 48.5% | 43.7% | 49.8% |
| Currently Married | 45.4% | 41.9% | 48.0% |
| Married but Separated | 3.1% | 1.8% | 1.8% |
| Single Population | 51.5% | 56.3% | 50.2% |
| Never Married | 23.0% | 27.2% | 33.8% |
| Divorced | 21.6% | 17.3% | 10.8% |
| Widowed | 6.9% | 11.8% | 5.6% |
| space5 | | | |
| Household Size | 3.08 | 2.16 | 2.60 |
| Households | 954 | 2,709 | 124,010,992 |
| Family Households | 691 | 1,506 | 80,755,759 |
| Married couple, w/children | 33.1% | 24.1% | 30.5% |
| Married couple, no children | 38.6% | 45.2% | 42.9% |
| Non Family Households | 263 | 1,203 | 43,255,233 |
| Single householder, w/children | 26.9% | 20.7% | 15.8% |
| Single householder, no children | 1.3% | 10.1% | 10.8% |