| | Jacksonville, AL | Sylacauga, AL | United States |
| Population | 13,076 | 12,512 | 329,725,481 |
| Female Population | 52.3% | 54.5% | 50.5% |
| Male Population | 47.7% | 45.5% | 49.5% |
| Median Age | 30.8 | 37.6 | 38.4 |
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| Population - 2010 | 13,209 | 12,769 | 309,327,143 |
| Population - 2000 | 8,404 | 12,616 | 285,036,114 |
| Population - 1990 | 10,283 | 12,520 | 251,960,433 |
| Pop. 2000 to Now | 54.4% | -5.4% | 15.6% |
| Pop. 1990 to Now | 26.2% | -4.6% | 30.8% |
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| Population Density | 1,193.9 | 617.9 | 93.4 |
| Land Area | 11.0 | 20.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Jacksonville, AL | Sylacauga, AL | United States |
| Age 0 to 4 | 5.1% | 5.9% | 5.9% |
| Age 5 to 9 | 4.0% | 7.4% | 6.1% |
| Age 10 to 14 | 3.8% | 6.7% | 6.6% |
| Age 15 to 17 | 1.8% | 4.6% | 3.9% |
| Age 18 to 20 | 15.4% | 2.6% | 4.0% |
| Age 21 to 24 | 11.0% | 3.4% | 5.2% |
| Age 25 to 34 | 14.4% | 16.4% | 13.8% |
| Age 35 to 44 | 10.5% | 10.4% | 12.9% |
| Age 45 to 54 | 6.9% | 11.5% | 12.6% |
| Age 55 to 59 | 5.8% | 5.8% | 6.7% |
| Age 60 to 64 | 8.5% | 7.7% | 6.3% |
| Age 65 to 74 | 6.8% | 10.9% | 9.6% |
| Age 75 to 84 | 5.1% | 5.7% | 4.5% |
| Age 85 and over | 1.1% | 1.0% | 1.9% |
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| Race | | | |
| | Jacksonville, AL | Sylacauga, AL | United States |
| White | 71.8% | 63.1% | 59.4% |
| Black | 19.3% | 31.3% | 12.2% |
| Asian | 0.5% | 0.0% | 5.6% |
| Native American | 0.4% | 0.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.4% | 0.1% | 0.4% |
| Two or More Races | 2.4% | 3.0% | 3.2% |
| Hispanic | 5.0% | 1.8% | 18.4% |
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| Marriage & Family | | | |
| | Jacksonville, AL | Sylacauga, AL | United States |
| Married Population | 31.1% | 49.4% | 49.8% |
| Currently Married | 29.3% | 45.7% | 48.0% |
| Married but Separated | 1.8% | 3.8% | 1.8% |
| Single Population | 68.9% | 50.6% | 50.2% |
| Never Married | 51.8% | 31.4% | 33.8% |
| Divorced | 12.1% | 11.4% | 10.8% |
| Widowed | 5.0% | 7.8% | 5.6% |
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| Household Size | 2.24 | 2.37 | 2.60 |
| Households | 5,124 | 5,170 | 124,010,992 |
| Family Households | 2,461 | 3,234 | 80,755,759 |
| Married couple, w/children | 25.6% | 26.8% | 30.5% |
| Married couple, no children | 36.1% | 40.6% | 42.9% |
| Non Family Households | 2,663 | 1,936 | 43,255,233 |
| Single householder, w/children | 17.7% | 24.8% | 15.8% |
| Single householder, no children | 20.6% | 7.8% | 10.8% |