| | Arab, AL | Liberty, SC | United States |
| Population | 8,462 | 3,349 | 329,725,481 |
| Female Population | 50.2% | 46.9% | 50.5% |
| Male Population | 49.8% | 53.1% | 49.5% |
| Median Age | 40.6 | 33.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 8,102 | 3,252 | 309,327,143 |
| Population - 2000 | 7,174 | 3,009 | 285,036,114 |
| Population - 1990 | 6,321 | 3,228 | 251,960,433 |
| Pop. 2000 to Now | 17.2% | 4.7% | 15.6% |
| Pop. 1990 to Now | 33.0% | -2.4% | 30.8% |
| space4 | | | |
| Population Density | 635.1 | 752.8 | 93.4 |
| Land Area | 13.3 | 4.4 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Arab, AL | Liberty, SC | United States |
| Age 0 to 4 | 6.1% | 7.5% | 5.9% |
| Age 5 to 9 | 6.1% | 9.8% | 6.1% |
| Age 10 to 14 | 7.1% | 7.3% | 6.6% |
| Age 15 to 17 | 5.0% | 5.4% | 3.9% |
| Age 18 to 20 | 3.2% | 3.9% | 4.0% |
| Age 21 to 24 | 3.9% | 2.1% | 5.2% |
| Age 25 to 34 | 11.6% | 17.1% | 13.8% |
| Age 35 to 44 | 12.7% | 12.2% | 12.9% |
| Age 45 to 54 | 13.1% | 11.5% | 12.6% |
| Age 55 to 59 | 7.1% | 5.0% | 6.7% |
| Age 60 to 64 | 6.8% | 0.7% | 6.3% |
| Age 65 to 74 | 9.5% | 11.4% | 9.6% |
| Age 75 to 84 | 6.0% | 6.0% | 4.5% |
| Age 85 and over | 1.9% | 0.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Arab, AL | Liberty, SC | United States |
| White | 90.5% | 70.6% | 59.4% |
| Black | 1.0% | 19.6% | 12.2% |
| Asian | 1.7% | 0.0% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.6% | 5.0% | 3.2% |
| Hispanic | 4.8% | 4.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Arab, AL | Liberty, SC | United States |
| Married Population | 52.6% | 66.0% | 49.8% |
| Currently Married | 50.8% | 61.2% | 48.0% |
| Married but Separated | 1.9% | 4.8% | 1.8% |
| Single Population | 47.4% | 34.0% | 50.2% |
| Never Married | 23.2% | 23.4% | 33.8% |
| Divorced | 14.8% | 8.7% | 10.8% |
| Widowed | 9.3% | 1.8% | 5.6% |
| space5 | | | |
| Household Size | 2.55 | 2.58 | 2.60 |
| Households | 3,280 | 1,297 | 124,010,992 |
| Family Households | 2,133 | 898 | 80,755,759 |
| Married couple, w/children | 33.1% | 43.7% | 30.5% |
| Married couple, no children | 41.2% | 36.3% | 42.9% |
| Non Family Households | 1,147 | 399 | 43,255,233 |
| Single householder, w/children | 16.2% | 20.0% | 15.8% |
| Single householder, no children | 9.6% | 0.0% | 10.8% |