| | Bethlehem, NH | Tamworth, NH | United States |
| Population | 2,518 | 2,834 | 329,725,481 |
| Female Population | 57.1% | 50.9% | 50.5% |
| Male Population | 42.9% | 49.1% | 49.5% |
| Median Age | 53.2 | 40.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,532 | 2,872 | 309,327,143 |
| Population - 2000 | 2,199 | 2,510 | 285,036,114 |
| Population - 1990 | 2,033 | 2,165 | 251,960,433 |
| Pop. 2000 to Now | 20.8% | 23.3% | 15.6% |
| Pop. 1990 to Now | 30.6% | 42.9% | 30.8% |
| space4 | | | |
| Population Density | 27.8 | 47.5 | 93.4 |
| Land Area | 90.6 | 59.7 | 3,531,905.4 |
| Water Area | 0.4 | 1.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Bethlehem, NH | Tamworth, NH | United States |
| Age 0 to 4 | 2.7% | 2.0% | 5.9% |
| Age 5 to 9 | 5.4% | 7.0% | 6.1% |
| Age 10 to 14 | 3.5% | 13.0% | 6.6% |
| Age 15 to 17 | 3.5% | 4.7% | 3.9% |
| Age 18 to 20 | 0.7% | 0.0% | 4.0% |
| Age 21 to 24 | 2.9% | 4.2% | 5.2% |
| Age 25 to 34 | 7.6% | 10.7% | 13.8% |
| Age 35 to 44 | 7.4% | 13.9% | 12.9% |
| Age 45 to 54 | 21.6% | 8.8% | 12.6% |
| Age 55 to 59 | 11.2% | 7.7% | 6.7% |
| Age 60 to 64 | 10.8% | 8.8% | 6.3% |
| Age 65 to 74 | 16.2% | 10.9% | 9.6% |
| Age 75 to 84 | 4.8% | 6.4% | 4.5% |
| Age 85 and over | 1.6% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Bethlehem, NH | Tamworth, NH | United States |
| White | 96.2% | 87.6% | 59.4% |
| Black | 0.0% | 1.5% | 12.2% |
| Asian | 0.7% | 0.9% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.2% | 7.4% | 3.2% |
| Hispanic | 1.4% | 2.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Bethlehem, NH | Tamworth, NH | United States |
| Married Population | 48.3% | 53.3% | 49.8% |
| Currently Married | 47.0% | 52.8% | 48.0% |
| Married but Separated | 1.3% | 0.5% | 1.8% |
| Single Population | 51.7% | 46.7% | 50.2% |
| Never Married | 37.3% | 24.7% | 33.8% |
| Divorced | 9.1% | 12.3% | 10.8% |
| Widowed | 5.3% | 9.6% | 5.6% |
| space5 | | | |
| Household Size | 2.47 | 3.03 | 2.60 |
| Households | 1,004 | 932 | 124,010,992 |
| Family Households | 632 | 617 | 80,755,759 |
| Married couple, w/children | 17.6% | 40.2% | 30.5% |
| Married couple, no children | 57.1% | 36.1% | 42.9% |
| Non Family Households | 372 | 315 | 43,255,233 |
| Single householder, w/children | 20.1% | 17.2% | 15.8% |
| Single householder, no children | 5.2% | 6.5% | 10.8% |