| | Shelbyville, KY | Athens, AL | United States |
| Population | 16,932 | 25,213 | 329,725,481 |
| Female Population | 53.4% | 50.8% | 50.5% |
| Male Population | 46.6% | 49.2% | 49.5% |
| Median Age | 36.8 | 41.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 14,276 | 21,993 | 309,327,143 |
| Population - 2000 | 10,085 | 18,967 | 285,036,114 |
| Population - 1990 | 6,238 | 16,901 | 251,960,433 |
| Pop. 2000 to Now | 66.5% | 51.0% | 15.6% |
| Pop. 1990 to Now | 169.2% | 69.5% | 30.8% |
| space4 | | | |
| Population Density | 1,998.1 | 632.5 | 93.4 |
| Land Area | 8.5 | 39.9 | 3,531,905.4 |
| Water Area | 0.2 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Shelbyville, KY | Athens, AL | United States |
| Age 0 to 4 | 7.6% | 5.7% | 5.9% |
| Age 5 to 9 | 6.6% | 5.6% | 6.1% |
| Age 10 to 14 | 6.2% | 4.8% | 6.6% |
| Age 15 to 17 | 3.5% | 3.8% | 3.9% |
| Age 18 to 20 | 4.1% | 3.4% | 4.0% |
| Age 21 to 24 | 7.2% | 3.7% | 5.2% |
| Age 25 to 34 | 11.8% | 15.2% | 13.8% |
| Age 35 to 44 | 14.2% | 11.6% | 12.9% |
| Age 45 to 54 | 14.4% | 12.0% | 12.6% |
| Age 55 to 59 | 6.4% | 8.7% | 6.7% |
| Age 60 to 64 | 4.7% | 7.0% | 6.3% |
| Age 65 to 74 | 8.7% | 10.6% | 9.6% |
| Age 75 to 84 | 3.3% | 6.1% | 4.5% |
| Age 85 and over | 1.3% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Shelbyville, KY | Athens, AL | United States |
| White | 66.5% | 70.8% | 59.4% |
| Black | 11.2% | 15.1% | 12.2% |
| Asian | 1.9% | 1.8% | 5.6% |
| Native American | 0.0% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.8% | 0.0% | 0.4% |
| Two or More Races | 3.9% | 2.6% | 3.2% |
| Hispanic | 15.8% | 9.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Shelbyville, KY | Athens, AL | United States |
| Married Population | 53.3% | 54.8% | 49.8% |
| Currently Married | 49.2% | 53.5% | 48.0% |
| Married but Separated | 4.1% | 1.2% | 1.8% |
| Single Population | 46.7% | 45.2% | 50.2% |
| Never Married | 28.4% | 26.4% | 33.8% |
| Divorced | 14.4% | 11.2% | 10.8% |
| Widowed | 3.9% | 7.6% | 5.6% |
| space5 | | | |
| Household Size | 2.75 | 2.41 | 2.60 |
| Households | 6,088 | 10,211 | 124,010,992 |
| Family Households | 4,260 | 6,882 | 80,755,759 |
| Married couple, w/children | 34.7% | 26.7% | 30.5% |
| Married couple, no children | 35.6% | 48.3% | 42.9% |
| Non Family Households | 1,828 | 3,329 | 43,255,233 |
| Single householder, w/children | 17.3% | 15.0% | 15.8% |
| Single householder, no children | 12.3% | 10.0% | 10.8% |