| | Blackey, KY | Haverhill, NH | United States |
| Population | 128 | 4,605 | 329,725,481 |
| Female Population | 40.6% | 54.4% | 50.5% |
| Male Population | 59.4% | 45.6% | 49.5% |
| Median Age | 36.5 | 46.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 122 | 4,693 | 309,327,143 |
| Population - 2000 | 153 | 4,416 | 285,036,114 |
| Population - 1990 | 149 | 4,164 | 251,960,433 |
| Pop. 2000 to Now | -7.8% | 3.2% | 15.6% |
| Pop. 1990 to Now | -5.4% | 9.4% | 30.8% |
| space4 | | | |
| Population Density | 292.9 | 90.3 | 93.4 |
| Land Area | 0.4 | 51.0 | 3,531,905.4 |
| Water Area | 0.0 | 1.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Blackey, KY | Haverhill, NH | United States |
| Age 0 to 4 | 14.1% | 5.4% | 5.9% |
| Age 5 to 9 | 4.7% | 4.9% | 6.1% |
| Age 10 to 14 | 1.6% | 6.2% | 6.6% |
| Age 15 to 17 | 0.8% | 4.2% | 3.9% |
| Age 18 to 20 | 2.3% | 0.6% | 4.0% |
| Age 21 to 24 | 2.3% | 6.0% | 5.2% |
| Age 25 to 34 | 23.4% | 12.8% | 13.8% |
| Age 35 to 44 | 9.4% | 8.8% | 12.9% |
| Age 45 to 54 | 6.3% | 17.2% | 12.6% |
| Age 55 to 59 | 7.0% | 9.4% | 6.7% |
| Age 60 to 64 | 0.0% | 4.0% | 6.3% |
| Age 65 to 74 | 25.0% | 11.3% | 9.6% |
| Age 75 to 84 | 0.8% | 4.3% | 4.5% |
| Age 85 and over | 2.3% | 5.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Blackey, KY | Haverhill, NH | United States |
| White | 96.1% | 91.5% | 59.4% |
| Black | 0.0% | 0.2% | 12.2% |
| Asian | 0.0% | 0.9% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.3% | 3.9% | 3.2% |
| Hispanic | 1.6% | 3.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Blackey, KY | Haverhill, NH | United States |
| Married Population | 44.1% | 40.7% | 49.8% |
| Currently Married | 41.2% | 39.8% | 48.0% |
| Married but Separated | 2.9% | 0.9% | 1.8% |
| Single Population | 55.9% | 59.3% | 50.2% |
| Never Married | 36.3% | 28.6% | 33.8% |
| Divorced | 18.6% | 18.5% | 10.8% |
| Widowed | 1.0% | 12.2% | 5.6% |
| space5 | | | |
| Household Size | 2.72 | 2.42 | 2.60 |
| Households | 47 | 1,748 | 124,010,992 |
| Family Households | 25 | 978 | 80,755,759 |
| Married couple, w/children | 16.0% | 41.0% | 30.5% |
| Married couple, no children | 56.0% | 32.9% | 42.9% |
| Non Family Households | 22 | 770 | 43,255,233 |
| Single householder, w/children | 20.0% | 14.3% | 15.8% |
| Single householder, no children | 8.0% | 11.8% | 10.8% |