Rockingham sits on the southeast "Seacoast" region of the state, covering some of the more developed areas between Manchester and Portsmouth on the Atlantic Coast. The value of all land and rural real estate for sale in New Hampshire's Rockingham County recently was around $363 million, representing a total of 1,419 acres of land for sale in Rockingham County. Rockingham County ranks first out of 10 counties in New Hampshire for the total number of acres of land currently advertised for sale. Of all locations in Rockingham County with land for sale, Londonderry featured the most land for sale. Rockingham County is one of the ten largest counties in New Hampshire (795 square miles). It's located in the South New Hampshire region of New Hampshire.