| | Piedmont, AL | Arab, AL | United States |
| Population | 4,837 | 8,462 | 329,725,481 |
| Female Population | 54.3% | 50.2% | 50.5% |
| Male Population | 45.7% | 49.8% | 49.5% |
| Median Age | 41.5 | 40.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,829 | 8,102 | 309,327,143 |
| Population - 2000 | 5,120 | 7,174 | 285,036,114 |
| Population - 1990 | 5,288 | 6,321 | 251,960,433 |
| Pop. 2000 to Now | -12.7% | 17.2% | 15.6% |
| Pop. 1990 to Now | -15.5% | 33.0% | 30.8% |
| space4 | | | |
| Population Density | 493.0 | 635.1 | 93.4 |
| Land Area | 9.8 | 13.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Piedmont, AL | Arab, AL | United States |
| Age 0 to 4 | 6.3% | 6.1% | 5.9% |
| Age 5 to 9 | 5.0% | 6.1% | 6.1% |
| Age 10 to 14 | 6.9% | 7.1% | 6.6% |
| Age 15 to 17 | 3.7% | 5.0% | 3.9% |
| Age 18 to 20 | 4.8% | 3.2% | 4.0% |
| Age 21 to 24 | 7.0% | 3.9% | 5.2% |
| Age 25 to 34 | 10.4% | 11.6% | 13.8% |
| Age 35 to 44 | 10.5% | 12.7% | 12.9% |
| Age 45 to 54 | 17.1% | 13.1% | 12.6% |
| Age 55 to 59 | 6.3% | 7.1% | 6.7% |
| Age 60 to 64 | 8.7% | 6.8% | 6.3% |
| Age 65 to 74 | 6.7% | 9.5% | 9.6% |
| Age 75 to 84 | 5.0% | 6.0% | 4.5% |
| Age 85 and over | 1.5% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Piedmont, AL | Arab, AL | United States |
| White | 80.7% | 90.5% | 59.4% |
| Black | 11.3% | 1.0% | 12.2% |
| Asian | 0.0% | 1.7% | 5.6% |
| Native American | 0.3% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.1% | 1.6% | 3.2% |
| Hispanic | 6.6% | 4.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Piedmont, AL | Arab, AL | United States |
| Married Population | 40.8% | 52.6% | 49.8% |
| Currently Married | 39.4% | 50.8% | 48.0% |
| Married but Separated | 1.4% | 1.9% | 1.8% |
| Single Population | 59.2% | 47.4% | 50.2% |
| Never Married | 39.7% | 23.2% | 33.8% |
| Divorced | 12.6% | 14.8% | 10.8% |
| Widowed | 7.0% | 9.3% | 5.6% |
| space5 | | | |
| Household Size | 2.64 | 2.55 | 2.60 |
| Households | 1,828 | 3,280 | 124,010,992 |
| Family Households | 1,146 | 2,133 | 80,755,759 |
| Married couple, w/children | 23.6% | 33.1% | 30.5% |
| Married couple, no children | 42.8% | 41.2% | 42.9% |
| Non Family Households | 682 | 1,147 | 43,255,233 |
| Single householder, w/children | 24.6% | 16.2% | 15.8% |
| Single householder, no children | 9.1% | 9.6% | 10.8% |