| | Southwick, MA | Fall River, MA | United States |
| Population | 9,292 | 93,339 | 329,725,481 |
| Female Population | 50.1% | 51.8% | 50.5% |
| Male Population | 49.9% | 48.2% | 49.5% |
| Median Age | 47.1 | 39.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 9,506 | 88,885 | 309,327,143 |
| Population - 2000 | 8,835 | 91,938 | 285,036,114 |
| Population - 1990 | 7,667 | 92,703 | 251,960,433 |
| Pop. 2000 to Now | 10.0% | -2.3% | 15.6% |
| Pop. 1990 to Now | 26.7% | -3.1% | 30.8% |
| space4 | | | |
| Population Density | 301.5 | 2,818.7 | 93.4 |
| Land Area | 30.8 | 33.1 | 3,531,905.4 |
| Water Area | 0.8 | 7.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Southwick, MA | Fall River, MA | United States |
| Age 0 to 4 | 4.2% | 6.2% | 5.9% |
| Age 5 to 9 | 4.4% | 5.1% | 6.1% |
| Age 10 to 14 | 6.2% | 6.2% | 6.6% |
| Age 15 to 17 | 3.9% | 3.3% | 3.9% |
| Age 18 to 20 | 2.7% | 2.7% | 4.0% |
| Age 21 to 24 | 4.4% | 5.2% | 5.2% |
| Age 25 to 34 | 8.5% | 15.0% | 13.8% |
| Age 35 to 44 | 13.3% | 12.6% | 12.9% |
| Age 45 to 54 | 16.9% | 14.0% | 12.6% |
| Age 55 to 59 | 7.2% | 6.7% | 6.7% |
| Age 60 to 64 | 7.4% | 7.2% | 6.3% |
| Age 65 to 74 | 11.7% | 8.9% | 9.6% |
| Age 75 to 84 | 7.1% | 4.7% | 4.5% |
| Age 85 and over | 2.2% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Southwick, MA | Fall River, MA | United States |
| White | 91.9% | 71.4% | 59.4% |
| Black | 0.0% | 5.8% | 12.2% |
| Asian | 0.8% | 2.7% | 5.6% |
| Native American | 0.3% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.2% | 0.4% |
| Two or More Races | 2.4% | 7.0% | 3.2% |
| Hispanic | 4.6% | 11.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Southwick, MA | Fall River, MA | United States |
| Married Population | 56.6% | 42.8% | 49.8% |
| Currently Married | 56.1% | 40.1% | 48.0% |
| Married but Separated | 0.4% | 2.6% | 1.8% |
| Single Population | 43.4% | 57.2% | 50.2% |
| Never Married | 26.7% | 39.3% | 33.8% |
| Divorced | 8.4% | 11.3% | 10.8% |
| Widowed | 8.4% | 6.7% | 5.6% |
| space5 | | | |
| Household Size | 2.53 | 2.25 | 2.60 |
| Households | 3,648 | 40,862 | 124,010,992 |
| Family Households | 2,642 | 24,285 | 80,755,759 |
| Married couple, w/children | 26.9% | 20.4% | 30.5% |
| Married couple, no children | 54.4% | 37.6% | 42.9% |
| Non Family Households | 1,006 | 16,577 | 43,255,233 |
| Single householder, w/children | 10.3% | 28.0% | 15.8% |
| Single householder, no children | 8.4% | 14.0% | 10.8% |