| | Senecaville, OH | Cheat Lake, WV | United States |
| Population | 380 | 10,187 | 329,725,481 |
| Female Population | 46.3% | 51.7% | 50.5% |
| Male Population | 53.7% | 48.3% | 49.5% |
| Median Age | 40.3 | 42 | 38.4 |
| space3 | | | |
| Population - 2010 | 463 | 7,638 | 309,327,143 |
| Population - 2000 | 453 | 6,396 | 285,036,114 |
| Population - 1990 | 434 | 3,992 | 251,960,433 |
| Pop. 2000 to Now | -1.3% | 51.9% | 15.6% |
| Pop. 1990 to Now | 3.0% | 143.4% | 30.8% |
| space4 | | | |
| Population Density | 800.0 | 711.7 | 93.4 |
| Land Area | 0.5 | 14.3 | 3,531,905.4 |
| Water Area | 0.0 | 1.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Senecaville, OH | Cheat Lake, WV | United States |
| Age 0 to 4 | 3.7% | 6.5% | 5.9% |
| Age 5 to 9 | 3.2% | 6.5% | 6.1% |
| Age 10 to 14 | 8.2% | 6.6% | 6.6% |
| Age 15 to 17 | 1.1% | 2.5% | 3.9% |
| Age 18 to 20 | 3.2% | 1.6% | 4.0% |
| Age 21 to 24 | 2.1% | 2.6% | 5.2% |
| Age 25 to 34 | 21.1% | 12.7% | 13.8% |
| Age 35 to 44 | 9.5% | 15.0% | 12.9% |
| Age 45 to 54 | 7.9% | 15.9% | 12.6% |
| Age 55 to 59 | 11.3% | 6.3% | 6.7% |
| Age 60 to 64 | 8.7% | 8.4% | 6.3% |
| Age 65 to 74 | 11.8% | 8.6% | 9.6% |
| Age 75 to 84 | 3.9% | 6.0% | 4.5% |
| Age 85 and over | 4.5% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Senecaville, OH | Cheat Lake, WV | United States |
| White | 92.1% | 90.0% | 59.4% |
| Black | 1.8% | 3.2% | 12.2% |
| Asian | 0.0% | 2.0% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.2% | 0.4% |
| Two or More Races | 5.5% | 1.9% | 3.2% |
| Hispanic | 0.5% | 1.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Senecaville, OH | Cheat Lake, WV | United States |
| Married Population | 46.7% | 65.6% | 49.8% |
| Currently Married | 46.4% | 65.0% | 48.0% |
| Married but Separated | 0.3% | 0.5% | 1.8% |
| Single Population | 53.3% | 34.4% | 50.2% |
| Never Married | 29.7% | 22.2% | 33.8% |
| Divorced | 17.3% | 8.6% | 10.8% |
| Widowed | 6.2% | 3.6% | 5.6% |
| space5 | | | |
| Household Size | 2.04 | 2.48 | 2.60 |
| Households | 186 | 4,099 | 124,010,992 |
| Family Households | 109 | 2,882 | 80,755,759 |
| Married couple, w/children | 15.6% | 35.6% | 30.5% |
| Married couple, no children | 48.6% | 50.1% | 42.9% |
| Non Family Households | 77 | 1,217 | 43,255,233 |
| Single householder, w/children | 24.8% | 8.2% | 15.8% |
| Single householder, no children | 11.0% | 6.1% | 10.8% |