| | Fairfax, OK | Durant, OK | United States |
| Population | 1,214 | 18,358 | 329,725,481 |
| Female Population | 51.2% | 51.7% | 50.5% |
| Male Population | 48.9% | 48.3% | 49.5% |
| Median Age | 41 | 33.9 | 38.4 |
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| Population - 2010 | 1,377 | 15,899 | 309,327,143 |
| Population - 2000 | 1,555 | 13,549 | 285,036,114 |
| Population - 1990 | 1,749 | 12,823 | 251,960,433 |
| Pop. 2000 to Now | -20.1% | 41.4% | 15.6% |
| Pop. 1990 to Now | -29.0% | 49.4% | 30.8% |
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| Population Density | 1,589.0 | 687.7 | 93.4 |
| Land Area | 0.8 | 26.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Fairfax, OK | Durant, OK | United States |
| Age 0 to 4 | 6.8% | 5.3% | 5.9% |
| Age 5 to 9 | 3.9% | 7.2% | 6.1% |
| Age 10 to 14 | 9.1% | 6.0% | 6.6% |
| Age 15 to 17 | 3.9% | 3.1% | 3.9% |
| Age 18 to 20 | 3.3% | 6.3% | 4.0% |
| Age 21 to 24 | 2.6% | 7.6% | 5.2% |
| Age 25 to 34 | 12.9% | 16.7% | 13.8% |
| Age 35 to 44 | 11.6% | 12.4% | 12.9% |
| Age 45 to 54 | 10.8% | 10.2% | 12.6% |
| Age 55 to 59 | 6.5% | 4.5% | 6.7% |
| Age 60 to 64 | 8.9% | 4.8% | 6.3% |
| Age 65 to 74 | 7.3% | 8.5% | 9.6% |
| Age 75 to 84 | 9.1% | 4.6% | 4.5% |
| Age 85 and over | 3.3% | 2.8% | 1.9% |
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| Race | | | |
| | Fairfax, OK | Durant, OK | United States |
| White | 59.0% | 64.2% | 59.4% |
| Black | 3.5% | 2.8% | 12.2% |
| Asian | 0.2% | 1.1% | 5.6% |
| Native American | 20.8% | 14.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 15.1% | 8.2% | 3.2% |
| Hispanic | 1.4% | 8.9% | 18.4% |
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| Marriage & Family | | | |
| | Fairfax, OK | Durant, OK | United States |
| Married Population | 44.9% | 41.3% | 49.8% |
| Currently Married | 41.1% | 39.0% | 48.0% |
| Married but Separated | 3.8% | 2.3% | 1.8% |
| Single Population | 55.1% | 58.7% | 50.2% |
| Never Married | 29.2% | 34.9% | 33.8% |
| Divorced | 12.1% | 17.7% | 10.8% |
| Widowed | 13.7% | 6.2% | 5.6% |
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| Household Size | 2.67 | 2.42 | 2.60 |
| Households | 443 | 7,268 | 124,010,992 |
| Family Households | 295 | 4,379 | 80,755,759 |
| Married couple, w/children | 24.7% | 24.3% | 30.5% |
| Married couple, no children | 35.6% | 34.8% | 42.9% |
| Non Family Households | 148 | 2,889 | 43,255,233 |
| Single householder, w/children | 24.1% | 24.8% | 15.8% |
| Single householder, no children | 15.6% | 16.2% | 10.8% |