Southbridge Town, MA has a population of 16,824 and is the 2,543rd largest city in the United States. The population density is 831 per sq mi which is 32% higher than the Massachusetts average and 818% higher than the national average. The median age in Southbridge Town is 39 which is approximately 2% lower than the Massachusetts average of 39. In Southbridge Town, 51% of the population over 15 years of age are married, 68% speak English and 27% speak Spanish. 65% of Southbridge Town residents were born in Massachusetts, 16% were born out of state, 14% were born outside of the United States and 5% were foreign born.