| | Blair, OK | Mangum, OK | United States |
| Population | 542 | 2,705 | 329,725,481 |
| Female Population | 51.1% | 48.8% | 50.5% |
| Male Population | 48.9% | 51.2% | 49.5% |
| Median Age | 37.6 | 39.8 | 38.4 |
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| Population - 2010 | 819 | 2,993 | 309,327,143 |
| Population - 2000 | 894 | 2,924 | 285,036,114 |
| Population - 1990 | 922 | 3,344 | 251,960,433 |
| Pop. 2000 to Now | -17.6% | -8.0% | 15.6% |
| Pop. 1990 to Now | -20.1% | -19.6% | 30.8% |
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| Population Density | 1,170.6 | 1,545.7 | 93.4 |
| Land Area | 0.5 | 1.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Blair, OK | Mangum, OK | United States |
| Age 0 to 4 | 6.8% | 7.1% | 5.9% |
| Age 5 to 9 | 9.8% | 7.7% | 6.1% |
| Age 10 to 14 | 3.7% | 7.8% | 6.6% |
| Age 15 to 17 | 3.0% | 3.2% | 3.9% |
| Age 18 to 20 | 0.7% | 2.6% | 4.0% |
| Age 21 to 24 | 8.1% | 5.4% | 5.2% |
| Age 25 to 34 | 15.1% | 11.8% | 13.8% |
| Age 35 to 44 | 13.1% | 10.2% | 12.9% |
| Age 45 to 54 | 11.6% | 13.5% | 12.6% |
| Age 55 to 59 | 4.8% | 7.1% | 6.7% |
| Age 60 to 64 | 5.9% | 4.5% | 6.3% |
| Age 65 to 74 | 10.7% | 10.2% | 9.6% |
| Age 75 to 84 | 5.9% | 5.3% | 4.5% |
| Age 85 and over | 0.7% | 3.7% | 1.9% |
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| Race | | | |
| | Blair, OK | Mangum, OK | United States |
| White | 81.4% | 70.3% | 59.4% |
| Black | 0.0% | 3.7% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 11.4% | 6.9% | 3.2% |
| Hispanic | 7.2% | 18.8% | 18.4% |
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| Marriage & Family | | | |
| | Blair, OK | Mangum, OK | United States |
| Married Population | 42.6% | 54.6% | 49.8% |
| Currently Married | 40.3% | 50.0% | 48.0% |
| Married but Separated | 2.3% | 4.5% | 1.8% |
| Single Population | 57.4% | 45.4% | 50.2% |
| Never Married | 32.2% | 15.0% | 33.8% |
| Divorced | 18.1% | 16.7% | 10.8% |
| Widowed | 7.2% | 13.7% | 5.6% |
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| Household Size | 2.08 | 2.27 | 2.60 |
| Households | 261 | 1,150 | 124,010,992 |
| Family Households | 172 | 744 | 80,755,759 |
| Married couple, w/children | 15.7% | 53.8% | 30.5% |
| Married couple, no children | 36.0% | 20.4% | 42.9% |
| Non Family Households | 89 | 406 | 43,255,233 |
| Single householder, w/children | 39.5% | 21.0% | 15.8% |
| Single householder, no children | 8.7% | 4.8% | 10.8% |