| | Gallaway, TN | Brighton, TN | United States |
| Population | 652 | 2,883 | 329,725,481 |
| Female Population | 63.8% | 52.2% | 50.5% |
| Male Population | 36.2% | 47.8% | 49.5% |
| Median Age | 48.6 | 31.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 673 | 2,891 | 309,327,143 |
| Population - 2000 | 666 | 1,719 | 285,036,114 |
| Population - 1990 | 762 | 717 | 251,960,433 |
| Pop. 2000 to Now | -2.7% | 70.4% | 15.6% |
| Pop. 1990 to Now | -15.0% | 308.5% | 30.8% |
| space4 | | | |
| Population Density | 104.6 | 949.6 | 93.4 |
| Land Area | 6.2 | 3.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Gallaway, TN | Brighton, TN | United States |
| Age 0 to 4 | 6.3% | 5.8% | 5.9% |
| Age 5 to 9 | 6.1% | 10.8% | 6.1% |
| Age 10 to 14 | 3.1% | 10.3% | 6.6% |
| Age 15 to 17 | 3.5% | 4.4% | 3.9% |
| Age 18 to 20 | 4.8% | 3.5% | 4.0% |
| Age 21 to 24 | 6.3% | 3.1% | 5.2% |
| Age 25 to 34 | 8.7% | 19.0% | 13.8% |
| Age 35 to 44 | 6.1% | 11.5% | 12.9% |
| Age 45 to 54 | 9.2% | 10.7% | 12.6% |
| Age 55 to 59 | 10.6% | 5.6% | 6.7% |
| Age 60 to 64 | 6.9% | 2.0% | 6.3% |
| Age 65 to 74 | 16.1% | 8.6% | 9.6% |
| Age 75 to 84 | 8.1% | 4.1% | 4.5% |
| Age 85 and over | 4.1% | 0.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Gallaway, TN | Brighton, TN | United States |
| White | 30.2% | 75.8% | 59.4% |
| Black | 68.3% | 19.9% | 12.2% |
| Asian | 0.2% | 1.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.6% | 2.0% | 3.2% |
| Hispanic | 0.8% | 0.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Gallaway, TN | Brighton, TN | United States |
| Married Population | 27.6% | 48.4% | 49.8% |
| Currently Married | 20.1% | 47.9% | 48.0% |
| Married but Separated | 7.4% | 0.6% | 1.8% |
| Single Population | 72.4% | 51.6% | 50.2% |
| Never Married | 45.0% | 27.2% | 33.8% |
| Divorced | 13.4% | 17.4% | 10.8% |
| Widowed | 14.0% | 7.0% | 5.6% |
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| Household Size | 1.96 | 2.99 | 2.60 |
| Households | 277 | 963 | 124,010,992 |
| Family Households | 131 | 788 | 80,755,759 |
| Married couple, w/children | 7.6% | 37.4% | 30.5% |
| Married couple, no children | 26.7% | 24.5% | 42.9% |
| Non Family Households | 146 | 175 | 43,255,233 |
| Single householder, w/children | 48.1% | 25.6% | 15.8% |
| Single householder, no children | 17.6% | 12.4% | 10.8% |