| | Hollis, OK | Willow, OK | United States |
| Population | 1,591 | 175 | 329,725,481 |
| Female Population | 49.8% | 37.1% | 50.5% |
| Male Population | 50.2% | 62.9% | 49.5% |
| Median Age | 38.1 | 59.9 | 38.4 |
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| Population - 2010 | 2,076 | 148 | 309,327,143 |
| Population - 2000 | 2,264 | 114 | 285,036,114 |
| Population - 1990 | 2,584 | 142 | 251,960,433 |
| Pop. 2000 to Now | -19.7% | 19.3% | 15.6% |
| Pop. 1990 to Now | -29.6% | -4.2% | 30.8% |
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| Population Density | 1,103.3 | 653.0 | 93.4 |
| Land Area | 1.4 | 0.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hollis, OK | Willow, OK | United States |
| Age 0 to 4 | 4.9% | 0.6% | 5.9% |
| Age 5 to 9 | 7.1% | 4.6% | 6.1% |
| Age 10 to 14 | 7.5% | 2.3% | 6.6% |
| Age 15 to 17 | 5.3% | 6.9% | 3.9% |
| Age 18 to 20 | 3.1% | 0.0% | 4.0% |
| Age 21 to 24 | 3.5% | 0.0% | 5.2% |
| Age 25 to 34 | 14.3% | 18.9% | 13.8% |
| Age 35 to 44 | 9.2% | 8.6% | 12.9% |
| Age 45 to 54 | 15.9% | 4.6% | 12.6% |
| Age 55 to 59 | 7.0% | 4.0% | 6.7% |
| Age 60 to 64 | 8.3% | 14.3% | 6.3% |
| Age 65 to 74 | 7.9% | 5.1% | 9.6% |
| Age 75 to 84 | 4.5% | 30.3% | 4.5% |
| Age 85 and over | 1.4% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hollis, OK | Willow, OK | United States |
| White | 42.0% | 89.7% | 59.4% |
| Black | 9.9% | 0.0% | 12.2% |
| Asian | 0.6% | 0.0% | 5.6% |
| Native American | 3.8% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.1% | 0.0% | 3.2% |
| Hispanic | 41.5% | 10.3% | 18.4% |
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| Marriage & Family | | | |
| | Hollis, OK | Willow, OK | United States |
| Married Population | 46.5% | 33.3% | 49.8% |
| Currently Married | 43.9% | 33.3% | 48.0% |
| Married but Separated | 2.7% | 0.0% | 1.8% |
| Single Population | 53.5% | 66.7% | 50.2% |
| Never Married | 28.9% | 24.7% | 33.8% |
| Divorced | 19.4% | 8.6% | 10.8% |
| Widowed | 5.2% | 33.3% | 5.6% |
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| Household Size | 2.46 | 1.70 | 2.60 |
| Households | 621 | 103 | 124,010,992 |
| Family Households | 363 | 20 | 80,755,759 |
| Married couple, w/children | 30.3% | 55.0% | 30.5% |
| Married couple, no children | 40.8% | 45.0% | 42.9% |
| Non Family Households | 258 | 83 | 43,255,233 |
| Single householder, w/children | 21.2% | 0.0% | 15.8% |
| Single householder, no children | 7.7% | 0.0% | 10.8% |