Haverhill is a town in Grafton County, New Hampshire, United States. The population was 4,416 at the 2000 census. Haverhill includes the villages of Woodsville, Pike, North Haverhill and the district of Mountain Lakes. Located here are Bedell Bridge State Park, Black Mountain State Forest, Kinder Memorial Forest, and Oliverian Valley Wildlife Preserve. It is home to the annual North Haverhill Fair, and to a branch of the New Hampshire Community Technical Colleges. The village of North Haverhill is county seat of Grafton County.