| | Henniker, NH | Bow, NH | United States |
| Population | 5,671 | 8,227 | 329,725,481 |
| Female Population | 46.7% | 50.6% | 50.5% |
| Male Population | 53.3% | 49.4% | 49.5% |
| Median Age | 33 | 41.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,833 | 7,525 | 309,327,143 |
| Population - 2000 | 4,433 | 7,138 | 285,036,114 |
| Population - 1990 | 4,151 | 5,500 | 251,960,433 |
| Pop. 2000 to Now | 12.9% | 13.0% | 15.6% |
| Pop. 1990 to Now | 20.6% | 46.6% | 30.8% |
| space4 | | | |
| Population Density | 128.8 | 293.5 | 93.4 |
| Land Area | 44.0 | 28.0 | 3,531,905.4 |
| Water Area | 0.7 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Henniker, NH | Bow, NH | United States |
| Age 0 to 4 | 5.3% | 6.9% | 5.9% |
| Age 5 to 9 | 6.9% | 7.2% | 6.1% |
| Age 10 to 14 | 5.2% | 7.0% | 6.6% |
| Age 15 to 17 | 1.1% | 5.2% | 3.9% |
| Age 18 to 20 | 9.1% | 3.1% | 4.0% |
| Age 21 to 24 | 9.8% | 3.0% | 5.2% |
| Age 25 to 34 | 13.8% | 9.4% | 13.8% |
| Age 35 to 44 | 9.1% | 13.9% | 12.9% |
| Age 45 to 54 | 6.3% | 14.1% | 12.6% |
| Age 55 to 59 | 7.9% | 8.1% | 6.7% |
| Age 60 to 64 | 6.0% | 6.3% | 6.3% |
| Age 65 to 74 | 16.6% | 9.4% | 9.6% |
| Age 75 to 84 | 2.8% | 4.3% | 4.5% |
| Age 85 and over | 0.1% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Henniker, NH | Bow, NH | United States |
| White | 94.0% | 95.2% | 59.4% |
| Black | 1.2% | 0.0% | 12.2% |
| Asian | 0.5% | 0.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 2.2% | 3.2% |
| Hispanic | 3.1% | 1.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Henniker, NH | Bow, NH | United States |
| Married Population | 46.3% | 70.4% | 49.8% |
| Currently Married | 44.8% | 70.3% | 48.0% |
| Married but Separated | 1.6% | 0.1% | 1.8% |
| Single Population | 53.7% | 29.6% | 50.2% |
| Never Married | 40.1% | 20.2% | 33.8% |
| Divorced | 12.8% | 5.0% | 10.8% |
| Widowed | 0.8% | 4.3% | 5.6% |
| space5 | | | |
| Household Size | 2.44 | 2.94 | 2.60 |
| Households | 2,098 | 2,802 | 124,010,992 |
| Family Households | 1,279 | 2,363 | 80,755,759 |
| Married couple, w/children | 22.8% | 43.4% | 30.5% |
| Married couple, no children | 53.2% | 49.9% | 42.9% |
| Non Family Households | 819 | 439 | 43,255,233 |
| Single householder, w/children | 15.9% | 2.7% | 15.8% |
| Single householder, no children | 8.1% | 4.1% | 10.8% |