Marion Center, MA has a population of 1,357 and is the 13,288th largest city in the United States. The population density is 1,332 per sq mi which is 111% higher than the Massachusetts average and 1370% higher than the national average. The median age in Marion Center is 50 which is approximately 26% higher than the Massachusetts average of 39. In Marion Center, 54% of the population over 15 years of age are married, 91% speak English and 2% speak Spanish. 55% of Marion Center residents were born in Massachusetts, 40% were born out of state, 2% were born outside of the United States and 3% were foreign born.