- Boston (US: /ˈbɔːstən/), officially the City of Boston, is the capital and most populous city of the U.S. state of Massachusetts, and the cultural and financial center of New England in the Northeastern United States, with an area of 48.4 sq mi (125 km2) and a population of 675,647 in 2020. Greater Boston metropolitan statistical area is the eleventh-largest in the country.
