| | Flatwoods, KY | Huntington, WV | United States |
| Population | 7,314 | 46,923 | 329,725,481 |
| Female Population | 50.9% | 52.8% | 50.5% |
| Male Population | 49.1% | 47.2% | 49.5% |
| Median Age | 41.8 | 36.4 | 38.4 |
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| Population - 2010 | 7,434 | 49,284 | 309,327,143 |
| Population - 2000 | 7,605 | 51,475 | 285,036,114 |
| Population - 1990 | 7,799 | 54,844 | 251,960,433 |
| Pop. 2000 to Now | -7.2% | -12.7% | 15.6% |
| Pop. 1990 to Now | -9.5% | -18.1% | 30.8% |
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| Population Density | 2,253.9 | 2,893.1 | 93.4 |
| Land Area | 3.2 | 16.2 | 3,531,905.4 |
| Water Area | 0.0 | 2.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Flatwoods, KY | Huntington, WV | United States |
| Age 0 to 4 | 4.4% | 5.2% | 5.9% |
| Age 5 to 9 | 10.1% | 5.3% | 6.1% |
| Age 10 to 14 | 5.7% | 5.1% | 6.6% |
| Age 15 to 17 | 2.4% | 2.4% | 3.9% |
| Age 18 to 20 | 2.5% | 7.6% | 4.0% |
| Age 21 to 24 | 4.4% | 10.3% | 5.2% |
| Age 25 to 34 | 10.3% | 12.7% | 13.8% |
| Age 35 to 44 | 13.0% | 10.6% | 12.9% |
| Age 45 to 54 | 14.5% | 12.1% | 12.6% |
| Age 55 to 59 | 6.4% | 6.3% | 6.7% |
| Age 60 to 64 | 6.6% | 5.1% | 6.3% |
| Age 65 to 74 | 10.7% | 10.3% | 9.6% |
| Age 75 to 84 | 5.9% | 5.1% | 4.5% |
| Age 85 and over | 3.0% | 1.8% | 1.9% |
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| Race | | | |
| | Flatwoods, KY | Huntington, WV | United States |
| White | 97.6% | 84.6% | 59.4% |
| Black | 0.6% | 7.9% | 12.2% |
| Asian | 0.2% | 1.5% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.5% | 0.4% |
| Two or More Races | 0.7% | 3.5% | 3.2% |
| Hispanic | 0.7% | 1.8% | 18.4% |
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| Marriage & Family | | | |
| | Flatwoods, KY | Huntington, WV | United States |
| Married Population | 50.1% | 35.9% | 49.8% |
| Currently Married | 48.3% | 34.5% | 48.0% |
| Married but Separated | 1.8% | 1.4% | 1.8% |
| Single Population | 49.9% | 64.1% | 50.2% |
| Never Married | 22.6% | 42.8% | 33.8% |
| Divorced | 16.6% | 15.1% | 10.8% |
| Widowed | 10.6% | 6.2% | 5.6% |
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| Household Size | 2.50 | 2.22 | 2.60 |
| Households | 2,884 | 19,757 | 124,010,992 |
| Family Households | 1,927 | 9,220 | 80,755,759 |
| Married couple, w/children | 23.8% | 23.9% | 30.5% |
| Married couple, no children | 45.6% | 43.0% | 42.9% |
| Non Family Households | 957 | 10,537 | 43,255,233 |
| Single householder, w/children | 19.1% | 20.0% | 15.8% |
| Single householder, no children | 11.5% | 13.1% | 10.8% |