A combined almost 1,000 acres were listed for sale in Hampden County recently; the value of all Hampden County farms, rural land, hunting land and other land for sale was nearly $57 million. Hampden County ranks eighth out of 14 counties in the Bay State for the combined amount of land currently advertised for sale. Of all locations in Hampden County with farms and rural real estate for sale, Westfield had the most land for sale. Hampden County is one of the ten biggest counties in Massachusetts (634 square miles). It's located in the Western Massachusetts region of the state.