| | Troy, AL | Andalusia, AL | United States |
| Population | 17,765 | 8,764 | 329,725,481 |
| Female Population | 54.4% | 53.5% | 50.5% |
| Male Population | 45.6% | 46.5% | 49.5% |
| Median Age | 25 | 39.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 18,195 | 9,022 | 309,327,143 |
| Population - 2000 | 13,935 | 8,794 | 285,036,114 |
| Population - 1990 | 13,051 | 9,269 | 251,960,433 |
| Pop. 2000 to Now | 34.6% | -1.3% | 15.6% |
| Pop. 1990 to Now | 43.8% | -6.4% | 30.8% |
| space4 | | | |
| Population Density | 629.6 | 445.9 | 93.4 |
| Land Area | 28.2 | 19.7 | 3,531,905.4 |
| Water Area | 0.1 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Troy, AL | Andalusia, AL | United States |
| Age 0 to 4 | 4.8% | 7.4% | 5.9% |
| Age 5 to 9 | 6.0% | 6.8% | 6.1% |
| Age 10 to 14 | 3.9% | 4.6% | 6.6% |
| Age 15 to 17 | 2.1% | 4.8% | 3.9% |
| Age 18 to 20 | 15.6% | 3.4% | 4.0% |
| Age 21 to 24 | 17.7% | 4.6% | 5.2% |
| Age 25 to 34 | 11.6% | 11.1% | 13.8% |
| Age 35 to 44 | 10.0% | 12.2% | 12.9% |
| Age 45 to 54 | 7.7% | 10.5% | 12.6% |
| Age 55 to 59 | 4.3% | 6.0% | 6.7% |
| Age 60 to 64 | 5.7% | 8.8% | 6.3% |
| Age 65 to 74 | 5.5% | 11.0% | 9.6% |
| Age 75 to 84 | 3.3% | 4.7% | 4.5% |
| Age 85 and over | 1.8% | 4.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Troy, AL | Andalusia, AL | United States |
| White | 54.0% | 71.9% | 59.4% |
| Black | 38.9% | 23.2% | 12.2% |
| Asian | 3.2% | 0.0% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.1% | 1.8% | 3.2% |
| Hispanic | 0.5% | 3.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Troy, AL | Andalusia, AL | United States |
| Married Population | 28.0% | 37.6% | 49.8% |
| Currently Married | 27.4% | 35.4% | 48.0% |
| Married but Separated | 0.6% | 2.2% | 1.8% |
| Single Population | 72.1% | 62.4% | 50.2% |
| Never Married | 58.4% | 34.3% | 33.8% |
| Divorced | 8.9% | 17.5% | 10.8% |
| Widowed | 4.7% | 10.7% | 5.6% |
| space5 | | | |
| Household Size | 2.54 | 2.65 | 2.60 |
| Households | 6,287 | 3,148 | 124,010,992 |
| Family Households | 2,852 | 1,928 | 80,755,759 |
| Married couple, w/children | 21.1% | 20.8% | 30.5% |
| Married couple, no children | 43.5% | 38.0% | 42.9% |
| Non Family Households | 3,435 | 1,220 | 43,255,233 |
| Single householder, w/children | 25.0% | 26.2% | 15.8% |
| Single householder, no children | 10.4% | 15.0% | 10.8% |