Massachusetts's 5th congressional district is a congressional district in eastern Massachusetts. The district is represented by Katherine Clark. Massachusetts congressional redistricting after the 2010 census has changed the borders of the district starting with the elections of 2012, with the new 3rd district largely taking the place of the old 5th. The 5th district covers many of the communities represented in the old 7th district. Its current municipalities are Arlington, Ashland, Belmont, parts of Cambridge, Framingham, Holliston, Lexington, Lincoln, Malden, Medford, Melrose, Natick, Revere, Sherborn, Southborough, Stoneham, parts of Sudbury, Waltham, Watertown, Wayland, Weston, Winchester, Winthrop, and Woburn, which are primarily found in Middlesex as well as Suffolk and Worcester Co