Watertown, Massachusetts is in the United States.
The Treaty of Watertown , the first foreign treaty concluded by the United States of America after the adoption of the Declaration of Independence , was signed on July 19 , 1776 , in the Edmund Fowle House in the town of Watertown , Massachusetts Bay . The Town of Watertown is a city in Middlesex County , Massachusetts , United States . It is part of the Greater Boston area . 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 ( Brigham Historic District ) , Coolidge Square , East Watertown , Watertown Square and the West End .