| | Oneonta, AL | Hartselle, AL | United States |
| Population | 6,778 | 15,308 | 329,725,481 |
| Female Population | 50.6% | 53.3% | 50.5% |
| Male Population | 49.5% | 46.7% | 49.5% |
| Median Age | 42 | 40.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,584 | 14,273 | 309,327,143 |
| Population - 2000 | 5,576 | 12,019 | 285,036,114 |
| Population - 1990 | 4,844 | 10,795 | 251,960,433 |
| Pop. 2000 to Now | 18.4% | 20.4% | 15.6% |
| Pop. 1990 to Now | 36.3% | 34.0% | 30.8% |
| space4 | | | |
| Population Density | 430.3 | 931.4 | 93.4 |
| Land Area | 15.8 | 16.4 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Oneonta, AL | Hartselle, AL | United States |
| Age 0 to 4 | 6.6% | 5.4% | 5.9% |
| Age 5 to 9 | 2.7% | 6.8% | 6.1% |
| Age 10 to 14 | 6.9% | 5.6% | 6.6% |
| Age 15 to 17 | 6.7% | 5.0% | 3.9% |
| Age 18 to 20 | 0.1% | 3.7% | 4.0% |
| Age 21 to 24 | 3.9% | 5.1% | 5.2% |
| Age 25 to 34 | 9.7% | 11.7% | 13.8% |
| Age 35 to 44 | 16.4% | 11.8% | 12.9% |
| Age 45 to 54 | 10.4% | 14.4% | 12.6% |
| Age 55 to 59 | 6.3% | 6.3% | 6.7% |
| Age 60 to 64 | 6.3% | 7.5% | 6.3% |
| Age 65 to 74 | 10.1% | 10.0% | 9.6% |
| Age 75 to 84 | 8.9% | 5.1% | 4.5% |
| Age 85 and over | 5.0% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Oneonta, AL | Hartselle, AL | United States |
| White | 80.2% | 84.0% | 59.4% |
| Black | 3.8% | 6.0% | 12.2% |
| Asian | 1.3% | 0.9% | 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 | 1.8% | 6.3% | 3.2% |
| Hispanic | 12.9% | 2.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Oneonta, AL | Hartselle, AL | United States |
| Married Population | 49.6% | 54.9% | 49.8% |
| Currently Married | 47.6% | 54.6% | 48.0% |
| Married but Separated | 2.1% | 0.4% | 1.8% |
| Single Population | 50.4% | 45.1% | 50.2% |
| Never Married | 21.5% | 26.8% | 33.8% |
| Divorced | 16.8% | 10.6% | 10.8% |
| Widowed | 12.0% | 7.7% | 5.6% |
| space5 | | | |
| Household Size | 2.19 | 2.68 | 2.60 |
| Households | 2,922 | 5,711 | 124,010,992 |
| Family Households | 1,725 | 4,208 | 80,755,759 |
| Married couple, w/children | 36.7% | 29.4% | 30.5% |
| Married couple, no children | 40.1% | 44.6% | 42.9% |
| Non Family Households | 1,197 | 1,503 | 43,255,233 |
| Single householder, w/children | 14.0% | 13.5% | 15.8% |
| Single householder, no children | 9.2% | 12.6% | 10.8% |