The North County Branch first opened in July 1979 in a trailer on a site in Clinton that was formerly the Daz O'Dell. Seven years later the library moved to a storefront in the Grey Rock Plaza and three years later to the library opened in Annandale Square where it remained for ten years. In 1999, a new branch was built in Clinton Town, incorporating the former Grandin Library, an endowment library that had been a vital part of Clinton Town for 101 years. The Grandin Library is honored in the North County Branch Library with a small conference room containing materials and furniture from the original library and furnished by the Friends of the Hunterdon County Library.