| | Lake Tansi, TN | Crab Orchard, TN | United States |
| Population | 4,707 | 896 | 329,725,481 |
| Female Population | 49.4% | 51.7% | 50.5% |
| Male Population | 50.6% | 48.3% | 49.5% |
| Median Age | 53.4 | 42 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,435 | 756 | 309,327,143 |
| Population - 2000 | 2,621 | 838 | 285,036,114 |
| Population - 1990 | 2,029 | 876 | 251,960,433 |
| Pop. 2000 to Now | 67.4% | -9.6% | 15.6% |
| Pop. 1990 to Now | 116.3% | -13.5% | 30.8% |
| space4 | | | |
| Population Density | 553.0 | 81.9 | 93.4 |
| Land Area | 8.5 | 10.9 | 3,531,905.4 |
| Water Area | 0.8 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lake Tansi, TN | Crab Orchard, TN | United States |
| Age 0 to 4 | 6.8% | 5.0% | 5.9% |
| Age 5 to 9 | 5.8% | 8.4% | 6.1% |
| Age 10 to 14 | 2.4% | 7.0% | 6.6% |
| Age 15 to 17 | 2.7% | 2.5% | 3.9% |
| Age 18 to 20 | 2.2% | 1.3% | 4.0% |
| Age 21 to 24 | 2.8% | 4.6% | 5.2% |
| Age 25 to 34 | 7.0% | 15.2% | 13.8% |
| Age 35 to 44 | 10.9% | 7.3% | 12.9% |
| Age 45 to 54 | 11.3% | 9.9% | 12.6% |
| Age 55 to 59 | 7.0% | 6.9% | 6.7% |
| Age 60 to 64 | 7.2% | 12.1% | 6.3% |
| Age 65 to 74 | 21.4% | 12.9% | 9.6% |
| Age 75 to 84 | 10.2% | 5.8% | 4.5% |
| Age 85 and over | 2.4% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lake Tansi, TN | Crab Orchard, TN | United States |
| White | 94.5% | 95.8% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 2.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.5% | 3.3% | 3.2% |
| Hispanic | 0.9% | 0.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lake Tansi, TN | Crab Orchard, TN | United States |
| Married Population | 62.4% | 66.6% | 49.8% |
| Currently Married | 61.1% | 63.3% | 48.0% |
| Married but Separated | 1.3% | 3.4% | 1.8% |
| Single Population | 37.6% | 33.4% | 50.2% |
| Never Married | 12.4% | 13.0% | 33.8% |
| Divorced | 12.0% | 10.7% | 10.8% |
| Widowed | 13.1% | 9.7% | 5.6% |
| space5 | | | |
| Household Size | 2.14 | 2.25 | 2.60 |
| Households | 2,201 | 398 | 124,010,992 |
| Family Households | 1,359 | 280 | 80,755,759 |
| Married couple, w/children | 26.6% | 33.2% | 30.5% |
| Married couple, no children | 60.3% | 50.0% | 42.9% |
| Non Family Households | 842 | 118 | 43,255,233 |
| Single householder, w/children | 9.4% | 12.9% | 15.8% |
| Single householder, no children | 3.6% | 3.9% | 10.8% |