| | Southwick, MA | Wilbraham, MA | United States |
| Population | 9,292 | 14,600 | 329,725,481 |
| Female Population | 50.1% | 53.4% | 50.5% |
| Male Population | 49.9% | 46.6% | 49.5% |
| Median Age | 47.1 | 45.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 9,506 | 14,226 | 309,327,143 |
| Population - 2000 | 8,835 | 13,473 | 285,036,114 |
| Population - 1990 | 7,667 | 12,635 | 251,960,433 |
| Pop. 2000 to Now | 10.0% | 8.9% | 15.6% |
| Pop. 1990 to Now | 26.7% | 16.1% | 30.8% |
| space4 | | | |
| Population Density | 301.5 | 658.7 | 93.4 |
| Land Area | 30.8 | 22.2 | 3,531,905.4 |
| Water Area | 0.8 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Southwick, MA | Wilbraham, MA | United States |
| Age 0 to 4 | 4.2% | 3.0% | 5.9% |
| Age 5 to 9 | 4.4% | 5.7% | 6.1% |
| Age 10 to 14 | 6.2% | 7.3% | 6.6% |
| Age 15 to 17 | 3.9% | 5.8% | 3.9% |
| Age 18 to 20 | 2.7% | 2.3% | 4.0% |
| Age 21 to 24 | 4.4% | 3.5% | 5.2% |
| Age 25 to 34 | 8.5% | 10.3% | 13.8% |
| Age 35 to 44 | 13.3% | 11.6% | 12.9% |
| Age 45 to 54 | 16.9% | 12.1% | 12.6% |
| Age 55 to 59 | 7.2% | 7.4% | 6.7% |
| Age 60 to 64 | 7.4% | 8.6% | 6.3% |
| Age 65 to 74 | 11.7% | 13.8% | 9.6% |
| Age 75 to 84 | 7.1% | 4.4% | 4.5% |
| Age 85 and over | 2.2% | 4.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Southwick, MA | Wilbraham, MA | United States |
| White | 91.9% | 88.8% | 59.4% |
| Black | 0.0% | 2.7% | 12.2% |
| Asian | 0.8% | 0.7% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 2.4% | 0.6% | 3.2% |
| Hispanic | 4.6% | 6.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Southwick, MA | Wilbraham, MA | United States |
| Married Population | 56.6% | 55.1% | 49.8% |
| Currently Married | 56.1% | 54.8% | 48.0% |
| Married but Separated | 0.4% | 0.3% | 1.8% |
| Single Population | 43.4% | 44.9% | 50.2% |
| Never Married | 26.7% | 27.8% | 33.8% |
| Divorced | 8.4% | 10.1% | 10.8% |
| Widowed | 8.4% | 7.0% | 5.6% |
| space5 | | | |
| Household Size | 2.53 | 2.66 | 2.60 |
| Households | 3,648 | 5,365 | 124,010,992 |
| Family Households | 2,642 | 3,982 | 80,755,759 |
| Married couple, w/children | 26.9% | 34.2% | 30.5% |
| Married couple, no children | 54.4% | 46.8% | 42.9% |
| Non Family Households | 1,006 | 1,383 | 43,255,233 |
| Single householder, w/children | 10.3% | 10.5% | 15.8% |
| Single householder, no children | 8.4% | 8.5% | 10.8% |