| | Upper Marlboro, MD | Oklahoma City, OK | United States |
| Population | 621 | 673,183 | 329,725,481 |
| Female Population | 54.8% | 50.4% | 50.5% |
| Male Population | 45.3% | 49.6% | 49.5% |
| Median Age | 38.5 | 34.9 | 38.4 |
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| Population - 2010 | 686 | 582,560 | 309,327,143 |
| Population - 2000 | 648 | 506,132 | 285,036,114 |
| Population - 1990 | 745 | 444,719 | 251,960,433 |
| Pop. 2000 to Now | 3.7% | 30.9% | 15.6% |
| Pop. 1990 to Now | -9.8% | 48.9% | 30.8% |
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| Population Density | 1,511.0 | 1,110.1 | 93.4 |
| Land Area | 0.4 | 606.4 | 3,531,905.4 |
| Water Area | 0.0 | 14.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Upper Marlboro, MD | Oklahoma City, OK | United States |
| Age 0 to 4 | 4.0% | 7.1% | 5.9% |
| Age 5 to 9 | 4.2% | 7.1% | 6.1% |
| Age 10 to 14 | 6.6% | 7.2% | 6.6% |
| Age 15 to 17 | 4.0% | 4.0% | 3.9% |
| Age 18 to 20 | 2.1% | 3.7% | 4.0% |
| Age 21 to 24 | 2.1% | 5.3% | 5.2% |
| Age 25 to 34 | 18.4% | 15.8% | 13.8% |
| Age 35 to 44 | 23.0% | 13.9% | 12.9% |
| Age 45 to 54 | 11.6% | 11.6% | 12.6% |
| Age 55 to 59 | 9.0% | 5.9% | 6.7% |
| Age 60 to 64 | 6.0% | 5.7% | 6.3% |
| Age 65 to 74 | 6.8% | 7.9% | 9.6% |
| Age 75 to 84 | 1.6% | 3.6% | 4.5% |
| Age 85 and over | 0.6% | 1.3% | 1.9% |
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| Race | | | |
| | Upper Marlboro, MD | Oklahoma City, OK | United States |
| White | 36.4% | 53.1% | 59.4% |
| Black | 62.0% | 13.6% | 12.2% |
| Asian | 0.0% | 4.4% | 5.6% |
| Native American | 0.0% | 2.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 1.6% | 6.3% | 3.2% |
| Hispanic | 0.0% | 19.9% | 18.4% |
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| Marriage & Family | | | |
| | Upper Marlboro, MD | Oklahoma City, OK | United States |
| Married Population | 23.4% | 48.7% | 49.8% |
| Currently Married | 20.8% | 46.6% | 48.0% |
| Married but Separated | 2.6% | 2.1% | 1.8% |
| Single Population | 76.6% | 51.3% | 50.2% |
| Never Married | 56.0% | 33.3% | 33.8% |
| Divorced | 17.4% | 12.7% | 10.8% |
| Widowed | 3.2% | 5.3% | 5.6% |
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| Household Size | 2.06 | 2.49 | 2.60 |
| Households | 302 | 265,519 | 124,010,992 |
| Family Households | 135 | 163,029 | 80,755,759 |
| Married couple, w/children | 8.9% | 32.2% | 30.5% |
| Married couple, no children | 29.6% | 37.8% | 42.9% |
| Non Family Households | 167 | 102,490 | 43,255,233 |
| Single householder, w/children | 38.5% | 19.4% | 15.8% |
| Single householder, no children | 23.0% | 10.5% | 10.8% |