| | Philadelphia, MS | Huntsville, AL | United States |
| Population | 7,107 | 210,081 | 329,725,481 |
| Female Population | 53.5% | 51.3% | 50.5% |
| Male Population | 46.5% | 48.7% | 49.5% |
| Median Age | 37.7 | 37.1 | 38.4 |
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| Population - 2010 | 7,462 | 180,926 | 309,327,143 |
| Population - 2000 | 7,303 | 158,216 | 285,036,114 |
| Population - 1990 | 6,758 | 159,789 | 251,960,433 |
| Pop. 2000 to Now | -4.1% | 28.3% | 15.6% |
| Pop. 1990 to Now | 3.6% | 27.0% | 30.8% |
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| Population Density | 582.0 | 980.1 | 93.4 |
| Land Area | 12.2 | 214.4 | 3,531,905.4 |
| Water Area | 0.0 | 1.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Philadelphia, MS | Huntsville, AL | United States |
| Age 0 to 4 | 5.9% | 5.8% | 5.9% |
| Age 5 to 9 | 7.5% | 5.7% | 6.1% |
| Age 10 to 14 | 8.9% | 5.4% | 6.6% |
| Age 15 to 17 | 5.3% | 2.9% | 3.9% |
| Age 18 to 20 | 4.6% | 4.8% | 4.0% |
| Age 21 to 24 | 3.5% | 7.1% | 5.2% |
| Age 25 to 34 | 11.3% | 15.5% | 13.8% |
| Age 35 to 44 | 12.7% | 12.1% | 12.9% |
| Age 45 to 54 | 10.8% | 11.5% | 12.6% |
| Age 55 to 59 | 4.2% | 6.8% | 6.7% |
| Age 60 to 64 | 11.4% | 6.2% | 6.3% |
| Age 65 to 74 | 8.9% | 9.3% | 9.6% |
| Age 75 to 84 | 3.7% | 4.8% | 4.5% |
| Age 85 and over | 1.2% | 2.1% | 1.9% |
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| Race | | | |
| | Philadelphia, MS | Huntsville, AL | United States |
| White | 40.7% | 57.0% | 59.4% |
| Black | 54.4% | 30.6% | 12.2% |
| Asian | 0.6% | 2.2% | 5.6% |
| Native American | 0.6% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 2.6% | 3.3% | 3.2% |
| Hispanic | 1.1% | 6.4% | 18.4% |
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| Marriage & Family | | | |
| | Philadelphia, MS | Huntsville, AL | United States |
| Married Population | 38.7% | 45.7% | 49.8% |
| Currently Married | 36.5% | 43.6% | 48.0% |
| Married but Separated | 2.2% | 2.1% | 1.8% |
| Single Population | 61.3% | 54.3% | 50.2% |
| Never Married | 37.8% | 36.1% | 33.8% |
| Divorced | 14.1% | 12.4% | 10.8% |
| Widowed | 9.5% | 5.9% | 5.6% |
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| Household Size | 2.62 | 2.21 | 2.60 |
| Households | 2,634 | 91,048 | 124,010,992 |
| Family Households | 1,626 | 51,704 | 80,755,759 |
| Married couple, w/children | 18.3% | 23.3% | 30.5% |
| Married couple, no children | 38.1% | 45.6% | 42.9% |
| Non Family Households | 1,008 | 39,344 | 43,255,233 |
| Single householder, w/children | 30.9% | 19.0% | 15.8% |
| Single householder, no children | 12.7% | 12.1% | 10.8% |