| | Mount Vernon, IN | Cullman, AL | United States |
| Population | 6,861 | 17,892 | 329,725,481 |
| Female Population | 52.3% | 52.2% | 50.5% |
| Male Population | 47.7% | 47.8% | 49.5% |
| Median Age | 41.1 | 41.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,788 | 15,301 | 309,327,143 |
| Population - 2000 | 7,478 | 13,995 | 285,036,114 |
| Population - 1990 | 7,217 | 13,367 | 251,960,433 |
| Pop. 2000 to Now | -14.1% | 18.4% | 15.6% |
| Pop. 1990 to Now | -11.0% | 23.9% | 30.8% |
| space4 | | | |
| Population Density | 2,426.1 | 834.1 | 93.4 |
| Land Area | 2.8 | 21.5 | 3,531,905.4 |
| Water Area | 0.1 | 1.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mount Vernon, IN | Cullman, AL | United States |
| Age 0 to 4 | 6.0% | 4.2% | 5.9% |
| Age 5 to 9 | 5.9% | 5.2% | 6.1% |
| Age 10 to 14 | 5.2% | 6.3% | 6.6% |
| Age 15 to 17 | 4.1% | 4.5% | 3.9% |
| Age 18 to 20 | 2.5% | 3.6% | 4.0% |
| Age 21 to 24 | 4.3% | 6.0% | 5.2% |
| Age 25 to 34 | 13.8% | 10.7% | 13.8% |
| Age 35 to 44 | 12.5% | 14.0% | 12.9% |
| Age 45 to 54 | 9.9% | 14.5% | 12.6% |
| Age 55 to 59 | 5.8% | 6.2% | 6.7% |
| Age 60 to 64 | 8.2% | 4.6% | 6.3% |
| Age 65 to 74 | 12.5% | 11.7% | 9.6% |
| Age 75 to 84 | 6.7% | 6.3% | 4.5% |
| Age 85 and over | 2.6% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mount Vernon, IN | Cullman, AL | United States |
| White | 91.0% | 90.6% | 59.4% |
| Black | 2.6% | 1.1% | 12.2% |
| Asian | 0.0% | 0.8% | 5.6% |
| Native American | 0.2% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 1.9% | 3.8% | 3.2% |
| Hispanic | 4.4% | 3.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mount Vernon, IN | Cullman, AL | United States |
| Married Population | 53.0% | 49.6% | 49.8% |
| Currently Married | 53.0% | 48.4% | 48.0% |
| Married but Separated | 0.0% | 1.3% | 1.8% |
| Single Population | 47.0% | 50.4% | 50.2% |
| Never Married | 22.5% | 28.1% | 33.8% |
| Divorced | 17.6% | 15.5% | 10.8% |
| Widowed | 7.0% | 6.8% | 5.6% |
| space5 | | | |
| Household Size | 2.11 | 2.28 | 2.60 |
| Households | 3,209 | 7,577 | 124,010,992 |
| Family Households | 1,882 | 4,694 | 80,755,759 |
| Married couple, w/children | 21.7% | 30.8% | 30.5% |
| Married couple, no children | 51.3% | 44.4% | 42.9% |
| Non Family Households | 1,327 | 2,883 | 43,255,233 |
| Single householder, w/children | 21.6% | 16.6% | 15.8% |
| Single householder, no children | 5.4% | 8.2% | 10.8% |