The Town of Watertown is a city in Middlesex County, Massachusetts, United States. It is part of the Greater Boston area. The population was 31,915 at the 2010 census. Watertown is one of fourteen Massachusetts municipalities that have applied for, and been granted, city forms of government but wish to retain "The town of" in their official names.Watertown is made up of six neighborhoods: Bemis, Brigham, Coolidge Square, East Watertown, Watertown Square and the West End.