| | Welch, WV | Damascus, MD | United States |
| Population | 3,050 | 16,945 | 329,725,481 |
| Female Population | 34.5% | 51.7% | 50.5% |
| Male Population | 65.5% | 48.3% | 49.5% |
| Median Age | 45 | 40.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,395 | 15,520 | 309,327,143 |
| Population - 2000 | 2,683 | 11,430 | 285,036,114 |
| Population - 1990 | 3,028 | 9,817 | 251,960,433 |
| Pop. 2000 to Now | -41.3% | 37.3% | 15.6% |
| Pop. 1990 to Now | -48.0% | 59.9% | 30.8% |
| space4 | | | |
| Population Density | 505.2 | 1,466.3 | 93.4 |
| Land Area | 6.0 | 11.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Welch, WV | Damascus, MD | United States |
| Age 0 to 4 | 0.0% | 4.8% | 5.9% |
| Age 5 to 9 | 4.7% | 5.6% | 6.1% |
| Age 10 to 14 | 4.0% | 7.0% | 6.6% |
| Age 15 to 17 | 0.3% | 5.3% | 3.9% |
| Age 18 to 20 | 0.5% | 5.3% | 4.0% |
| Age 21 to 24 | 4.3% | 3.8% | 5.2% |
| Age 25 to 34 | 13.9% | 10.9% | 13.8% |
| Age 35 to 44 | 22.4% | 13.6% | 12.9% |
| Age 45 to 54 | 14.2% | 13.4% | 12.6% |
| Age 55 to 59 | 11.5% | 9.7% | 6.7% |
| Age 60 to 64 | 5.5% | 7.5% | 6.3% |
| Age 65 to 74 | 11.4% | 7.6% | 9.6% |
| Age 75 to 84 | 5.0% | 4.1% | 4.5% |
| Age 85 and over | 2.2% | 1.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Welch, WV | Damascus, MD | United States |
| White | 70.7% | 67.4% | 59.4% |
| Black | 22.0% | 9.2% | 12.2% |
| Asian | 0.0% | 5.9% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.6% | 0.4% |
| Two or More Races | 1.5% | 4.3% | 3.2% |
| Hispanic | 5.5% | 12.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Welch, WV | Damascus, MD | United States |
| Married Population | 34.1% | 58.5% | 49.8% |
| Currently Married | 31.6% | 58.0% | 48.0% |
| Married but Separated | 2.5% | 0.5% | 1.8% |
| Single Population | 65.9% | 41.5% | 50.2% |
| Never Married | 36.1% | 29.5% | 33.8% |
| Divorced | 20.8% | 8.8% | 10.8% |
| Widowed | 9.0% | 3.2% | 5.6% |
| space5 | | | |
| Household Size | 2.19 | 2.95 | 2.60 |
| Households | 806 | 5,741 | 124,010,992 |
| Family Households | 418 | 4,639 | 80,755,759 |
| Married couple, w/children | 10.5% | 39.8% | 30.5% |
| Married couple, no children | 53.1% | 43.9% | 42.9% |
| Non Family Households | 388 | 1,102 | 43,255,233 |
| Single householder, w/children | 21.1% | 6.7% | 15.8% |
| Single householder, no children | 15.3% | 9.7% | 10.8% |