| | Seminole, OK | Jennings, OK | United States |
| Population | 7,131 | 289 | 329,725,481 |
| Female Population | 55.5% | 45.7% | 50.5% |
| Male Population | 44.5% | 54.3% | 49.5% |
| Median Age | 33.1 | 42.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,474 | 363 | 309,327,143 |
| Population - 2000 | 6,899 | 373 | 285,036,114 |
| Population - 1990 | 7,071 | 381 | 251,960,433 |
| Pop. 2000 to Now | 2.0% | -4.6% | 15.6% |
| Pop. 1990 to Now | -0.5% | -6.6% | 30.8% |
| space4 | | | |
| Population Density | 525.5 | 525.5 | 93.4 |
| Land Area | 13.6 | 0.6 | 3,531,905.4 |
| Water Area | 0.6 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Seminole, OK | Jennings, OK | United States |
| Age 0 to 4 | 7.7% | 9.7% | 5.9% |
| Age 5 to 9 | 7.5% | 8.0% | 6.1% |
| Age 10 to 14 | 6.6% | 2.4% | 6.6% |
| Age 15 to 17 | 4.5% | 5.2% | 3.9% |
| Age 18 to 20 | 6.2% | 1.7% | 4.0% |
| Age 21 to 24 | 5.0% | 2.1% | 5.2% |
| Age 25 to 34 | 15.0% | 14.9% | 13.8% |
| Age 35 to 44 | 10.3% | 12.5% | 12.9% |
| Age 45 to 54 | 12.0% | 15.2% | 12.6% |
| Age 55 to 59 | 6.3% | 5.2% | 6.7% |
| Age 60 to 64 | 4.3% | 5.2% | 6.3% |
| Age 65 to 74 | 7.0% | 13.1% | 9.6% |
| Age 75 to 84 | 5.2% | 4.2% | 4.5% |
| Age 85 and over | 2.4% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Seminole, OK | Jennings, OK | United States |
| White | 59.1% | 72.0% | 59.4% |
| Black | 4.2% | 0.0% | 12.2% |
| Asian | 0.4% | 0.0% | 5.6% |
| Native American | 22.6% | 5.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 6.8% | 21.8% | 3.2% |
| Hispanic | 6.9% | 0.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Seminole, OK | Jennings, OK | United States |
| Married Population | 40.5% | 51.9% | 49.8% |
| Currently Married | 38.4% | 49.4% | 48.0% |
| Married but Separated | 2.2% | 2.6% | 1.8% |
| Single Population | 59.5% | 48.1% | 50.2% |
| Never Married | 32.7% | 22.9% | 33.8% |
| Divorced | 15.2% | 18.2% | 10.8% |
| Widowed | 11.6% | 6.9% | 5.6% |
| space5 | | | |
| Household Size | 2.85 | 2.51 | 2.60 |
| Households | 2,393 | 115 | 124,010,992 |
| Family Households | 1,622 | 75 | 80,755,759 |
| Married couple, w/children | 30.1% | 24.0% | 30.5% |
| Married couple, no children | 25.7% | 45.3% | 42.9% |
| Non Family Households | 771 | 40 | 43,255,233 |
| Single householder, w/children | 27.1% | 17.3% | 15.8% |
| Single householder, no children | 17.1% | 13.3% | 10.8% |