Boston (pronounced /ˈbɒstən/ ( listen) BOSS-tən) is the capital city and most populous municipality of the Commonwealth of Massachusetts in the United States. It is also the seat of Suffolk County, although the county government was disbanded on July 1, 1999. The city proper covers 48 square miles (124 km2) with an estimated population of 673,184 in 2016, making it the largest city in the New England region of the northeastern United States. 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 such area in the country. As a combined statistical area (CSA), this wider commuting region is home to some 8.2 million people, making it the sixth-largest in the United States.