Boston officially the City of Boston, is the capital and largest city of the Commonwealth of Massachusetts and the cultural and financial center of the New England region of the Northeastern United States. The city boundaries encompass an area of about 48.4 sq mi (125 km2)[9] and a population of 675,647 as of 2020.[4] The city is the economic and cultural anchor of a substantially larger metropolitan area known as Greater Boston, a metropolitan statistical area (MSA) home to 4,941,632 people as of 2020, ranking as the tenth-largest MSA in the country.