The Borough of Watchung was organized on April 20, 1926 and covers an area of approximately 6.2 square miles.  Watchung was settled in the early eighteenth century and grew slowly until recent years.  In 1960 the population was 3,312 and in 2000 it was 5,613.

Around 1670, a group of Dutch settlers was traveling from the Amboys up an old Indian trail which is now Somerset Street. They were under the leadership of Captain Michaelson. The Watchung tribe of the Lenni-Lenape Indians was traveling the same trail for their summer trip to the ocean to fish and collect shells for wampum.

During the night the settlers were camped near what is now the center of the Borough. Deer Prong, an advance scout for Chief One Feather's tribe, was shot when he surprised a sentry. During the skirmish, Captain Michaelson was captured and was to be burned at the stake. Princess Wetumpka, who was traveling with the Dutch, and had some years ago saved the life of Chief One Feather, intervened and saved the life of Captain Michaelson. The Indians befriended the Dutch and allowed them to settle in the valley. The legend ends with the full tribal ceremony marriage of the Princess and Chief.