N.H. Rev. Stat. Ann. § 21:48

When used to refer to a municipality, and in the absence of applicable chapter or subdivision definitions, the term "governing body" shall mean the board of selectmen in a town, the board of aldermen or council in a city or town with a town council, the school board in a school district or the village district commissioners in a village district, or when used to refer to unincorporated towns or unorganized places, or both, the county commissioners.