Boston (US/ˈbɔːstən/UK/ˈbɒstən/)[10] is the capital and most populous city[3] of the Commonwealth of Massachusetts in the United States and the 21st most populous city in the United States.[11] The city proper covers 48.4 square miles (125 km2)[12] with an estimated population of 692,600 in 2019,[4] also making it the most populous city in New England.[3] It is the seat of Suffolk County (although the county government was disbanded on July 1, 1999).[13] 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 a census-estimated 4.8 million people in 2016 and ranking as the tenth-largest MSA in the country.[14] As a combined statistical area (CSA), this wider commuting region is home to some 8.2 million people, making it the sixth most populous in the United States.[15]