| | Gleason, TN | Belfast, NY | United States |
| Population | 1,381 | 1,802 | 329,725,481 |
| Female Population | 57.7% | 51.4% | 50.5% |
| Male Population | 42.3% | 48.6% | 49.5% |
| Median Age | 39.2 | 34.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,449 | 1,667 | 309,327,143 |
| Population - 2000 | 1,463 | 1,714 | 285,036,114 |
| Population - 1990 | 1,402 | 1,539 | 251,960,433 |
| Pop. 2000 to Now | -6.4% | -9.2% | 15.6% |
| Pop. 1990 to Now | -2.4% | 1.2% | 30.8% |
| space4 | | | |
| Population Density | 615.7 | 49.7 | 93.4 |
| Land Area | 2.2 | 36.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Gleason, TN | Belfast, NY | United States |
| Age 0 to 4 | 7.5% | 9.9% | 5.9% |
| Age 5 to 9 | 6.4% | 6.9% | 6.1% |
| Age 10 to 14 | 8.4% | 8.3% | 6.6% |
| Age 15 to 17 | 6.3% | 3.7% | 3.9% |
| Age 18 to 20 | 4.2% | 2.3% | 4.0% |
| Age 21 to 24 | 4.1% | 5.4% | 5.2% |
| Age 25 to 34 | 8.8% | 14.1% | 13.8% |
| Age 35 to 44 | 15.9% | 11.1% | 12.9% |
| Age 45 to 54 | 13.7% | 15.0% | 12.6% |
| Age 55 to 59 | 4.3% | 6.8% | 6.7% |
| Age 60 to 64 | 6.5% | 4.1% | 6.3% |
| Age 65 to 74 | 9.0% | 9.9% | 9.6% |
| Age 75 to 84 | 4.8% | 1.9% | 4.5% |
| Age 85 and over | 0.1% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Gleason, TN | Belfast, NY | United States |
| White | 91.6% | 97.2% | 59.4% |
| Black | 3.0% | 0.1% | 12.2% |
| Asian | 0.7% | 0.1% | 5.6% |
| Native American | 0.2% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.0% | 1.8% | 3.2% |
| Hispanic | 2.5% | 0.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Gleason, TN | Belfast, NY | United States |
| Married Population | 52.2% | 58.1% | 49.8% |
| Currently Married | 50.5% | 55.3% | 48.0% |
| Married but Separated | 1.8% | 2.8% | 1.8% |
| Single Population | 47.8% | 41.9% | 50.2% |
| Never Married | 23.9% | 21.0% | 33.8% |
| Divorced | 15.2% | 12.6% | 10.8% |
| Widowed | 8.7% | 8.3% | 5.6% |
| space5 | | | |
| Household Size | 2.50 | 3.02 | 2.60 |
| Households | 553 | 597 | 124,010,992 |
| Family Households | 362 | 408 | 80,755,759 |
| Married couple, w/children | 36.7% | 40.7% | 30.5% |
| Married couple, no children | 38.7% | 35.3% | 42.9% |
| Non Family Households | 191 | 189 | 43,255,233 |
| Single householder, w/children | 17.7% | 12.0% | 15.8% |
| Single householder, no children | 6.9% | 12.0% | 10.8% |