| | Sylacauga, AL | Marbury, AL | United States |
| Population | 12,512 | 1,893 | 329,725,481 |
| Female Population | 54.5% | 46.5% | 50.5% |
| Male Population | 45.5% | 53.5% | 49.5% |
| Median Age | 37.6 | 32.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 12,769 | 1,364 | 309,327,143 |
| Population - 2000 | 12,616 | 1,163 | 285,036,114 |
| Population - 1990 | 12,520 | 810 | 251,960,433 |
| Pop. 2000 to Now | -5.4% | 69.4% | 15.6% |
| Pop. 1990 to Now | -4.6% | 143.2% | 30.8% |
| space4 | | | |
| Population Density | 617.9 | 81.8 | 93.4 |
| Land Area | 20.3 | 23.2 | 3,531,905.4 |
| Water Area | 0.2 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Sylacauga, AL | Marbury, AL | United States |
| Age 0 to 4 | 5.9% | 8.8% | 5.9% |
| Age 5 to 9 | 7.4% | 8.5% | 6.1% |
| Age 10 to 14 | 6.7% | 14.2% | 6.6% |
| Age 15 to 17 | 4.6% | 2.8% | 3.9% |
| Age 18 to 20 | 2.6% | 4.8% | 4.0% |
| Age 21 to 24 | 3.4% | 0.9% | 5.2% |
| Age 25 to 34 | 16.4% | 15.5% | 13.8% |
| Age 35 to 44 | 10.4% | 20.2% | 12.9% |
| Age 45 to 54 | 11.5% | 7.7% | 12.6% |
| Age 55 to 59 | 5.8% | 6.1% | 6.7% |
| Age 60 to 64 | 7.7% | 4.4% | 6.3% |
| Age 65 to 74 | 10.9% | 3.0% | 9.6% |
| Age 75 to 84 | 5.7% | 2.3% | 4.5% |
| Age 85 and over | 1.0% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Sylacauga, AL | Marbury, AL | United States |
| White | 63.1% | 72.2% | 59.4% |
| Black | 31.3% | 18.8% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.6% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 3.0% | 0.0% | 3.2% |
| Hispanic | 1.8% | 9.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Sylacauga, AL | Marbury, AL | United States |
| Married Population | 49.4% | 51.7% | 49.8% |
| Currently Married | 45.7% | 49.8% | 48.0% |
| Married but Separated | 3.8% | 1.9% | 1.8% |
| Single Population | 50.6% | 48.3% | 50.2% |
| Never Married | 31.4% | 31.9% | 33.8% |
| Divorced | 11.4% | 11.3% | 10.8% |
| Widowed | 7.8% | 5.0% | 5.6% |
| space5 | | | |
| Household Size | 2.37 | 3.38 | 2.60 |
| Households | 5,170 | 558 | 124,010,992 |
| Family Households | 3,234 | 457 | 80,755,759 |
| Married couple, w/children | 26.8% | 54.7% | 30.5% |
| Married couple, no children | 40.6% | 19.9% | 42.9% |
| Non Family Households | 1,936 | 101 | 43,255,233 |
| Single householder, w/children | 24.8% | 5.0% | 15.8% |
| Single householder, no children | 7.8% | 20.4% | 10.8% |