| | Elk City, OK | Mount Vernon, IN | United States |
| Population | 11,743 | 6,861 | 329,725,481 |
| Female Population | 51.5% | 52.3% | 50.5% |
| Male Population | 48.5% | 47.7% | 49.5% |
| Median Age | 34.7 | 41.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 11,672 | 6,788 | 309,327,143 |
| Population - 2000 | 10,510 | 7,478 | 285,036,114 |
| Population - 1990 | 10,428 | 7,217 | 251,960,433 |
| Pop. 2000 to Now | 8.0% | -14.1% | 15.6% |
| Pop. 1990 to Now | 8.9% | -11.0% | 30.8% |
| space4 | | | |
| Population Density | 721.5 | 2,426.1 | 93.4 |
| Land Area | 16.3 | 2.8 | 3,531,905.4 |
| Water Area | 0.2 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Elk City, OK | Mount Vernon, IN | United States |
| Age 0 to 4 | 7.3% | 6.0% | 5.9% |
| Age 5 to 9 | 6.9% | 5.9% | 6.1% |
| Age 10 to 14 | 6.5% | 5.2% | 6.6% |
| Age 15 to 17 | 4.2% | 4.1% | 3.9% |
| Age 18 to 20 | 2.3% | 2.5% | 4.0% |
| Age 21 to 24 | 7.0% | 4.3% | 5.2% |
| Age 25 to 34 | 16.2% | 13.8% | 13.8% |
| Age 35 to 44 | 11.4% | 12.5% | 12.9% |
| Age 45 to 54 | 9.9% | 9.9% | 12.6% |
| Age 55 to 59 | 5.3% | 5.8% | 6.7% |
| Age 60 to 64 | 6.9% | 8.2% | 6.3% |
| Age 65 to 74 | 9.0% | 12.5% | 9.6% |
| Age 75 to 84 | 5.6% | 6.7% | 4.5% |
| Age 85 and over | 1.6% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Elk City, OK | Mount Vernon, IN | United States |
| White | 75.2% | 91.0% | 59.4% |
| Black | 2.1% | 2.6% | 12.2% |
| Asian | 1.2% | 0.0% | 5.6% |
| Native American | 2.4% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 1.0% | 1.9% | 3.2% |
| Hispanic | 17.7% | 4.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Elk City, OK | Mount Vernon, IN | United States |
| Married Population | 51.7% | 53.0% | 49.8% |
| Currently Married | 50.3% | 53.0% | 48.0% |
| Married but Separated | 1.4% | 0.0% | 1.8% |
| Single Population | 48.3% | 47.0% | 50.2% |
| Never Married | 25.0% | 22.5% | 33.8% |
| Divorced | 16.3% | 17.6% | 10.8% |
| Widowed | 7.1% | 7.0% | 5.6% |
| space5 | | | |
| Household Size | 2.37 | 2.11 | 2.60 |
| Households | 4,876 | 3,209 | 124,010,992 |
| Family Households | 2,854 | 1,882 | 80,755,759 |
| Married couple, w/children | 28.3% | 21.7% | 30.5% |
| Married couple, no children | 44.8% | 51.3% | 42.9% |
| Non Family Households | 2,022 | 1,327 | 43,255,233 |
| Single householder, w/children | 20.6% | 21.6% | 15.8% |
| Single householder, no children | 6.3% | 5.4% | 10.8% |