| | Allagash, ME | Richwood, WV | United States |
| Population | 209 | 2,604 | 329,725,481 |
| Female Population | 58.4% | 55.5% | 50.5% |
| Male Population | 41.6% | 44.6% | 49.5% |
| Median Age | 58.8 | 45.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 238 | 2,054 | 309,327,143 |
| Population - 2000 | 277 | 2,477 | 285,036,114 |
| Population - 1990 | 359 | 2,808 | 251,960,433 |
| Pop. 2000 to Now | -22.4% | -25.6% | 15.6% |
| Pop. 1990 to Now | -40.1% | -34.4% | 30.8% |
| space4 | | | |
| Population Density | 1.6 | 1,617.4 | 93.4 |
| Land Area | 128.6 | 1.6 | 3,531,905.4 |
| Water Area | 2.8 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Allagash, ME | Richwood, WV | United States |
| Age 0 to 4 | 2.4% | 3.7% | 5.9% |
| Age 5 to 9 | 3.3% | 10.9% | 6.1% |
| Age 10 to 14 | 4.3% | 3.5% | 6.6% |
| Age 15 to 17 | 2.9% | 1.4% | 3.9% |
| Age 18 to 20 | 1.4% | 1.6% | 4.0% |
| Age 21 to 24 | 2.4% | 2.5% | 5.2% |
| Age 25 to 34 | 1.9% | 11.2% | 13.8% |
| Age 35 to 44 | 6.2% | 14.6% | 12.9% |
| Age 45 to 54 | 20.1% | 15.9% | 12.6% |
| Age 55 to 59 | 5.3% | 4.1% | 6.7% |
| Age 60 to 64 | 5.7% | 5.6% | 6.3% |
| Age 65 to 74 | 27.3% | 13.7% | 9.6% |
| Age 75 to 84 | 6.7% | 6.0% | 4.5% |
| Age 85 and over | 10.0% | 5.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Allagash, ME | Richwood, WV | United States |
| White | 84.2% | 96.2% | 59.4% |
| Black | 0.0% | 1.3% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.5% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 2.9% | 0.0% | 0.4% |
| Two or More Races | 7.2% | 1.7% | 3.2% |
| Hispanic | 5.3% | 0.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Allagash, ME | Richwood, WV | United States |
| Married Population | 48.9% | 40.8% | 49.8% |
| Currently Married | 48.9% | 38.7% | 48.0% |
| Married but Separated | 0.0% | 2.1% | 1.8% |
| Single Population | 51.1% | 59.2% | 50.2% |
| Never Married | 21.8% | 18.2% | 33.8% |
| Divorced | 6.9% | 31.1% | 10.8% |
| Widowed | 22.3% | 9.9% | 5.6% |
| space5 | | | |
| Household Size | 1.80 | 2.62 | 2.60 |
| Households | 116 | 964 | 124,010,992 |
| Family Households | 49 | 512 | 80,755,759 |
| Married couple, w/children | 16.3% | 27.0% | 30.5% |
| Married couple, no children | 67.3% | 47.1% | 42.9% |
| Non Family Households | 67 | 452 | 43,255,233 |
| Single householder, w/children | 8.2% | 12.5% | 15.8% |
| Single householder, no children | 8.2% | 13.5% | 10.8% |