| | Springfield, VT | Somerville, NJ | United States |
| Population | 9,089 | 12,453 | 329,725,481 |
| Female Population | 48.3% | 47.7% | 50.5% |
| Male Population | 51.7% | 52.3% | 49.5% |
| Median Age | 51 | 36.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 9,360 | 12,107 | 309,327,143 |
| Population - 2000 | 9,078 | 12,423 | 285,036,114 |
| Population - 1990 | 9,579 | 11,632 | 251,960,433 |
| Pop. 2000 to Now | -2.2% | -2.1% | 15.6% |
| Pop. 1990 to Now | -7.4% | 4.5% | 30.8% |
| space4 | | | |
| Population Density | 185.4 | 5,326.4 | 93.4 |
| Land Area | 49.0 | 2.3 | 3,531,905.4 |
| Water Area | 0.4 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Springfield, VT | Somerville, NJ | United States |
| Age 0 to 4 | 2.4% | 5.5% | 5.9% |
| Age 5 to 9 | 3.4% | 4.0% | 6.1% |
| Age 10 to 14 | 4.1% | 6.3% | 6.6% |
| Age 15 to 17 | 1.9% | 3.3% | 3.9% |
| Age 18 to 20 | 3.2% | 2.6% | 4.0% |
| Age 21 to 24 | 6.2% | 6.6% | 5.2% |
| Age 25 to 34 | 9.7% | 17.3% | 13.8% |
| Age 35 to 44 | 14.6% | 16.5% | 12.9% |
| Age 45 to 54 | 9.5% | 12.1% | 12.6% |
| Age 55 to 59 | 11.3% | 4.5% | 6.7% |
| Age 60 to 64 | 10.3% | 6.8% | 6.3% |
| Age 65 to 74 | 13.9% | 6.6% | 9.6% |
| Age 75 to 84 | 7.5% | 6.5% | 4.5% |
| Age 85 and over | 2.0% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Springfield, VT | Somerville, NJ | United States |
| White | 94.8% | 51.8% | 59.4% |
| Black | 0.3% | 11.9% | 12.2% |
| Asian | 0.8% | 10.7% | 5.6% |
| Native American | 0.1% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.3% | 0.4% |
| Two or More Races | 2.1% | 2.3% | 3.2% |
| Hispanic | 1.8% | 22.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Springfield, VT | Somerville, NJ | United States |
| Married Population | 49.4% | 45.5% | 49.8% |
| Currently Married | 48.2% | 43.5% | 48.0% |
| Married but Separated | 1.2% | 1.9% | 1.8% |
| Single Population | 50.6% | 54.5% | 50.2% |
| Never Married | 28.0% | 39.2% | 33.8% |
| Divorced | 16.5% | 9.4% | 10.8% |
| Widowed | 6.1% | 6.0% | 5.6% |
| space5 | | | |
| Household Size | 2.19 | 2.46 | 2.60 |
| Households | 3,955 | 4,902 | 124,010,992 |
| Family Households | 2,116 | 2,857 | 80,755,759 |
| Married couple, w/children | 18.7% | 34.8% | 30.5% |
| Married couple, no children | 67.2% | 39.0% | 42.9% |
| Non Family Households | 1,839 | 2,045 | 43,255,233 |
| Single householder, w/children | 8.4% | 13.3% | 15.8% |
| Single householder, no children | 5.8% | 12.8% | 10.8% |