| | Nitro, WV | Charleston, WV | United States |
| Population | 6,630 | 49,055 | 329,725,481 |
| Female Population | 54.2% | 51.2% | 50.5% |
| Male Population | 45.8% | 48.8% | 49.5% |
| Median Age | 44.7 | 41.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,917 | 51,215 | 309,327,143 |
| Population - 2000 | 6,824 | 53,421 | 285,036,114 |
| Population - 1990 | 6,851 | 57,287 | 251,960,433 |
| Pop. 2000 to Now | -7.9% | -14.1% | 15.6% |
| Pop. 1990 to Now | -8.3% | -19.9% | 30.8% |
| space4 | | | |
| Population Density | 1,264.5 | 1,557.3 | 93.4 |
| Land Area | 5.2 | 31.5 | 3,531,905.4 |
| Water Area | 0.6 | 1.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Nitro, WV | Charleston, WV | United States |
| Age 0 to 4 | 2.9% | 5.5% | 5.9% |
| Age 5 to 9 | 9.8% | 4.9% | 6.1% |
| Age 10 to 14 | 10.0% | 4.8% | 6.6% |
| Age 15 to 17 | 3.9% | 3.7% | 3.9% |
| Age 18 to 20 | 0.8% | 3.6% | 4.0% |
| Age 21 to 24 | 2.9% | 4.6% | 5.2% |
| Age 25 to 34 | 9.2% | 13.4% | 13.8% |
| Age 35 to 44 | 11.1% | 12.8% | 12.9% |
| Age 45 to 54 | 16.0% | 12.7% | 12.6% |
| Age 55 to 59 | 9.6% | 7.6% | 6.7% |
| Age 60 to 64 | 4.9% | 6.8% | 6.3% |
| Age 65 to 74 | 10.4% | 11.4% | 9.6% |
| Age 75 to 84 | 7.5% | 5.5% | 4.5% |
| Age 85 and over | 0.9% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Nitro, WV | Charleston, WV | United States |
| White | 90.2% | 77.1% | 59.4% |
| Black | 3.5% | 14.1% | 12.2% |
| Asian | 0.0% | 2.4% | 5.6% |
| Native American | 0.4% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 5.3% | 4.9% | 3.2% |
| Hispanic | 0.5% | 1.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Nitro, WV | Charleston, WV | United States |
| Married Population | 55.0% | 43.3% | 49.8% |
| Currently Married | 54.0% | 41.7% | 48.0% |
| Married but Separated | 1.0% | 1.7% | 1.8% |
| Single Population | 45.0% | 56.7% | 50.2% |
| Never Married | 22.0% | 33.6% | 33.8% |
| Divorced | 14.7% | 16.1% | 10.8% |
| Widowed | 8.4% | 7.0% | 5.6% |
| space5 | | | |
| Household Size | 2.40 | 2.16 | 2.60 |
| Households | 2,767 | 21,779 | 124,010,992 |
| Family Households | 1,758 | 11,470 | 80,755,759 |
| Married couple, w/children | 32.5% | 23.3% | 30.5% |
| Married couple, no children | 35.7% | 46.5% | 42.9% |
| Non Family Households | 1,009 | 10,309 | 43,255,233 |
| Single householder, w/children | 19.7% | 18.4% | 15.8% |
| Single householder, no children | 12.0% | 11.7% | 10.8% |