The overall value of farms, hunting land and other rural land and acreage for sale in Merrimack County, New Hampshire, recently on Land.com was around $148 million. This represents almost 4,000 acres of farms, hunting land and other rural land and acreage for sale in Merrimack County. Merrimack County ranks fifth in the White Mountain State based on the total amount of acres of land for sale of all the counties in the Granite State. Of all locations in Merrimack County with farms and rural real estate for sale, Concord had 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.