790-1325 is a ZIP Code in Concord, Massachusetts. It is primarily located in Middlesex County, and includes the neighborhoods of Concord Heights, Concord Square, South Concord, and West Concord. The population of this ZIP Code is estimated at 8,411, with a median household income of around $117,000. Major landmarks in this ZIP Code include Walden Pond, the Old Manse, Minute Man National Historical Park, and Concord Armory.