| | Unicoi, TN | Erwin, TN | United States |
| Population | 3,793 | 6,052 | 329,725,481 |
| Female Population | 51.0% | 48.2% | 50.5% |
| Male Population | 49.0% | 51.8% | 49.5% |
| Median Age | 50.3 | 45 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,612 | 6,077 | 309,327,143 |
| Population - 2000 | 3,519 | 5,610 | 285,036,114 |
| Population - 1990 | 2,734 | 5,015 | 251,960,433 |
| Pop. 2000 to Now | 1.7% | 4.4% | 15.6% |
| Pop. 1990 to Now | 30.9% | 16.7% | 30.8% |
| space4 | | | |
| Population Density | 234.3 | 1,466.8 | 93.4 |
| Land Area | 16.2 | 4.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Unicoi, TN | Erwin, TN | United States |
| Age 0 to 4 | 4.0% | 1.5% | 5.9% |
| Age 5 to 9 | 3.3% | 5.2% | 6.1% |
| Age 10 to 14 | 5.5% | 5.5% | 6.6% |
| Age 15 to 17 | 1.2% | 5.8% | 3.9% |
| Age 18 to 20 | 1.9% | 2.3% | 4.0% |
| Age 21 to 24 | 5.8% | 7.4% | 5.2% |
| Age 25 to 34 | 16.3% | 8.7% | 13.8% |
| Age 35 to 44 | 7.7% | 13.8% | 12.9% |
| Age 45 to 54 | 13.1% | 16.4% | 12.6% |
| Age 55 to 59 | 9.8% | 4.5% | 6.7% |
| Age 60 to 64 | 9.3% | 6.8% | 6.3% |
| Age 65 to 74 | 11.8% | 10.2% | 9.6% |
| Age 75 to 84 | 8.5% | 7.8% | 4.5% |
| Age 85 and over | 1.9% | 4.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Unicoi, TN | Erwin, TN | United States |
| White | 93.8% | 87.7% | 59.4% |
| Black | 0.2% | 0.3% | 12.2% |
| Asian | 0.4% | 0.0% | 5.6% |
| Native American | 0.8% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 1.3% | 3.2% |
| Hispanic | 3.9% | 10.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Unicoi, TN | Erwin, TN | United States |
| Married Population | 50.5% | 54.1% | 49.8% |
| Currently Married | 47.9% | 52.1% | 48.0% |
| Married but Separated | 2.6% | 1.9% | 1.8% |
| Single Population | 49.5% | 45.9% | 50.2% |
| Never Married | 22.0% | 25.7% | 33.8% |
| Divorced | 18.0% | 12.8% | 10.8% |
| Widowed | 9.6% | 7.4% | 5.6% |
| space5 | | | |
| Household Size | 2.28 | 2.24 | 2.60 |
| Households | 1,603 | 2,600 | 124,010,992 |
| Family Households | 933 | 1,757 | 80,755,759 |
| Married couple, w/children | 29.5% | 29.4% | 30.5% |
| Married couple, no children | 45.7% | 48.6% | 42.9% |
| Non Family Households | 670 | 843 | 43,255,233 |
| Single householder, w/children | 7.5% | 12.6% | 15.8% |
| Single householder, no children | 17.4% | 9.4% | 10.8% |