Henniker is a town in Merrimack County, New Hampshire, United States. As of the 2010 census, the town had a total population of 4,836. Henniker is home to New England College, Ames State Forest, Craney Hill State Forest and Pats Peak Ski Area.The main village of the town, where 1,747 people resided at the 2010 census, is defined as the Henniker census-designated place, and is located along the Contoocook River at the junction of New Hampshire Route 114 with Old Concord Road. The town also includes the village of West Henniker.