First known as Gilmantown the town was home to the Gilman family of which there were 24 members receiving land grants. At one time it was the second largest town in the state, following Portsmouth. The orignal town was much larger than it is now with villages and parishes including Belmont, Gunstock Parish(Gilford) Hurricane, Tioga,Factory Village and Lakeport. A Parish first called Averytown, the site of an unprofitable Iron Mining enterprise is still known today as Gilmanton Iron Works.
Gilmanton Iron Works is located near the eastern boundary of the town, along a stretch of the Suncook River south of the outlet of Crystal Lake. New Hampshire Route 140 . The town of Gilmanton has several small lakes that are worth the visit for small hikes in with breath taking scenery year round. Ski mobiles heaven as well as cross country skiing or casual strolls near town.