Watertown is a city in Middlesex County, Massachusetts, and is part of Greater Boston. The population was 35,329 in the 2020 census. Its neighborhoods include Bemis, Coolidge Square, East Watertown, Watertown Square, and the West End.

Watertown was one of the first Massachusetts Bay Colony settlements organized by Puritan settlers in 1630. The city is home to the Perkins School for the Blind, the Armenian Library and Museum of America, and the historic Watertown Arsenal, which produced military armaments from 1816 through World War II.

Archeological evidence suggests that Watertown was inhabited for thousands of years before colonization. In the 1600s, two groups of Massachusett, the Pequossette and the Nonantum, had settlements on the banks of the river later called the Charles, and a contemporary source lists “Pigsgusset” as the native name of “Water towne.” The Pequossette built a fishing weir to trap herring at the site of the current Watertown Dam. The annual fish migration, as both alewife and blueback herring swim upstream from their adult home in the sea to spawn in the fresh water where they were hatched, still occurs every spring.

Watertown, first known to settlers as Saltonstall Plantation, was one of the earliest of the Massachusetts Bay Colony settlements. Founded in early 1630 by a group of settlers led by Richard Saltonstall and George Phillips, it was officially incorporated that same year. The alternate spelling “Waterton” is seen in some early documents.

The first buildings were upon land now included within the limits of Cambridge known as Gerry’s Landing. For its first quarter century Watertown ranked next to Boston in population and area. Since then its limits have been greatly reduced. Thrice portions have been added to Cambridge, and it has contributed territory to form the new towns of Weston (1712), Waltham (1738), Lincoln (1754) and Belmont (1859). In 1632 the residents of Watertown protested against being compelled to pay a tax for the erection of a stockade fort at Cambridge; this was the first protest in America against taxation without representation and led to the establishment of representative democracy in the colony. As early as the close of the 17th century, Watertown was the chief horse and cattle market in New England and was known for its fertile gardens and fine estates. Here about 1632 was erected the first gristmill in the colony, and in 1662 one of the first woolen mills in America was built here. The first burying ground, on Arlington Street, was established in the 1660s. It contains a monument to Joseph Coolidge, the only Watertown resident killed during the British retreat from Concord in April 1775.

Much excitement was generated in Watertown towards the start of the American Revolutionary War period. In 1773, many of its citizens were engaged with the Sons of Liberty in another tax protest, this time against the British Tea Tax which resulted in the famous Boston Tea Party protest.