Northfield is a town in Merrimack County, New Hampshire, United States. The population was 4,872 at the 2020 census. European settlers first arrived in Northfield in the early 1700s. Initially, Northfield was incorporated as part of Canterbury when that town was established in 1741. At the time it was a frontier town protected by a garrison fort er…Northfield is a town in Merrimack County, New Hampshire, United States. The population was 4,872 at the 2020 census. European settlers first arrived in Northfield in the early 1700s. Initially, Northfield was incorporated as part of Canterbury when that town was established in 1741. At the time it was a frontier town protected by a garrison fort erected on a hill close to Canterbury Center and commanded by Capt. Jeremiah Clough. Tradition has it that the first settlers of the "north fields" of Canterbury came from the scouts from this fort who patrolled the area in the 1740s.
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