| | Alton, NH | Putnam, CT | United States |
| Population | 5,826 | 9,250 | 329,725,481 |
| Female Population | 50.1% | 52.6% | 50.5% |
| Male Population | 49.9% | 47.4% | 49.5% |
| Median Age | 50.7 | 44.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,247 | 9,556 | 309,327,143 |
| Population - 2000 | 4,502 | 9,002 | 285,036,114 |
| Population - 1990 | 3,286 | 9,031 | 251,960,433 |
| Pop. 2000 to Now | 19.2% | 4.1% | 15.6% |
| Pop. 1990 to Now | 63.2% | 3.8% | 30.8% |
| space4 | | | |
| Population Density | 92.6 | 455.6 | 93.4 |
| Land Area | 62.9 | 20.3 | 3,531,905.4 |
| Water Area | 19.3 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Alton, NH | Putnam, CT | United States |
| Age 0 to 4 | 4.4% | 5.1% | 5.9% |
| Age 5 to 9 | 4.8% | 5.2% | 6.1% |
| Age 10 to 14 | 3.1% | 6.3% | 6.6% |
| Age 15 to 17 | 3.9% | 3.9% | 3.9% |
| Age 18 to 20 | 3.8% | 4.1% | 4.0% |
| Age 21 to 24 | 6.9% | 2.7% | 5.2% |
| Age 25 to 34 | 7.3% | 12.7% | 13.8% |
| Age 35 to 44 | 8.5% | 10.7% | 12.9% |
| Age 45 to 54 | 13.0% | 17.7% | 12.6% |
| Age 55 to 59 | 12.4% | 8.0% | 6.7% |
| Age 60 to 64 | 7.5% | 6.4% | 6.3% |
| Age 65 to 74 | 12.5% | 8.4% | 9.6% |
| Age 75 to 84 | 9.4% | 4.5% | 4.5% |
| Age 85 and over | 2.4% | 4.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Alton, NH | Putnam, CT | United States |
| White | 98.0% | 84.5% | 59.4% |
| Black | 0.0% | 0.7% | 12.2% |
| Asian | 0.0% | 1.1% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 1.1% | 4.6% | 3.2% |
| Hispanic | 0.9% | 9.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Alton, NH | Putnam, CT | United States |
| Married Population | 61.5% | 44.5% | 49.8% |
| Currently Married | 61.5% | 44.0% | 48.0% |
| Married but Separated | 0.0% | 0.6% | 1.8% |
| Single Population | 38.5% | 55.5% | 50.2% |
| Never Married | 27.1% | 32.5% | 33.8% |
| Divorced | 3.8% | 13.9% | 10.8% |
| Widowed | 7.6% | 9.0% | 5.6% |
| space5 | | | |
| Household Size | 2.73 | 2.39 | 2.60 |
| Households | 2,134 | 3,756 | 124,010,992 |
| Family Households | 1,803 | 2,285 | 80,755,759 |
| Married couple, w/children | 27.7% | 29.7% | 30.5% |
| Married couple, no children | 58.8% | 38.8% | 42.9% |
| Non Family Households | 331 | 1,471 | 43,255,233 |
| Single householder, w/children | 6.5% | 15.6% | 15.8% |
| Single householder, no children | 6.9% | 15.9% | 10.8% |