| | Springfield, MA | South Bend, IN | United States |
| Population | 155,770 | 102,786 | 329,725,481 |
| Female Population | 52.3% | 52.5% | 50.5% |
| Male Population | 47.7% | 47.5% | 49.5% |
| Median Age | 33.5 | 33.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 153,570 | 101,189 | 309,327,143 |
| Population - 2000 | 152,082 | 107,789 | 285,036,114 |
| Population - 1990 | 156,983 | 105,511 | 251,960,433 |
| Pop. 2000 to Now | 0.4% | -5.5% | 15.6% |
| Pop. 1990 to Now | -2.8% | -3.5% | 30.8% |
| space4 | | | |
| Population Density | 4,887.8 | 2,474.7 | 93.4 |
| Land Area | 31.9 | 41.5 | 3,531,905.4 |
| Water Area | 1.2 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Springfield, MA | South Bend, IN | United States |
| Age 0 to 4 | 6.5% | 7.0% | 5.9% |
| Age 5 to 9 | 7.1% | 7.5% | 6.1% |
| Age 10 to 14 | 7.1% | 7.8% | 6.6% |
| Age 15 to 17 | 4.2% | 4.5% | 3.9% |
| Age 18 to 20 | 6.1% | 3.8% | 4.0% |
| Age 21 to 24 | 6.5% | 5.9% | 5.2% |
| Age 25 to 34 | 14.5% | 14.9% | 13.8% |
| Age 35 to 44 | 12.1% | 12.8% | 12.9% |
| Age 45 to 54 | 11.4% | 11.5% | 12.6% |
| Age 55 to 59 | 6.4% | 4.5% | 6.7% |
| Age 60 to 64 | 5.4% | 5.8% | 6.3% |
| Age 65 to 74 | 7.7% | 8.4% | 9.6% |
| Age 75 to 84 | 3.5% | 3.3% | 4.5% |
| Age 85 and over | 1.5% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Springfield, MA | South Bend, IN | United States |
| White | 28.9% | 52.0% | 59.4% |
| Black | 18.2% | 24.8% | 12.2% |
| Asian | 2.7% | 2.0% | 5.6% |
| Native American | 0.2% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.7% | 0.4% |
| Two or More Races | 2.3% | 4.5% | 3.2% |
| Hispanic | 47.5% | 15.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Springfield, MA | South Bend, IN | United States |
| Married Population | 34.7% | 39.2% | 49.8% |
| Currently Married | 32.0% | 37.0% | 48.0% |
| Married but Separated | 2.8% | 2.1% | 1.8% |
| Single Population | 65.3% | 60.9% | 50.2% |
| Never Married | 50.6% | 42.0% | 33.8% |
| Divorced | 10.2% | 13.2% | 10.8% |
| Widowed | 4.5% | 5.6% | 5.6% |
| space5 | | | |
| Household Size | 2.57 | 2.46 | 2.60 |
| Households | 58,344 | 40,541 | 124,010,992 |
| Family Households | 35,926 | 22,471 | 80,755,759 |
| Married couple, w/children | 19.1% | 26.3% | 30.5% |
| Married couple, no children | 29.0% | 34.4% | 42.9% |
| Non Family Households | 22,418 | 18,070 | 43,255,233 |
| Single householder, w/children | 34.7% | 26.6% | 15.8% |
| Single householder, no children | 17.2% | 12.7% | 10.8% |