The value of farms, rural land, hunting land and other land for sale in Merrimack County, New Hampshire, recently on Land.com was approximately $241 million. This represents nearly 3,000 acres of land for sale in Merrimack County. Merrimack County ranks sixth in the Granite State for the total number of acres of land currently advertised for sale. Of all land for sale in Merrimack County, Concord featured the most land for sale. Merrimack County is one of the ten largest counties in New Hampshire (954 square miles). It's located in the Central New Hampshire region of New Hampshire.