Massachusetts's 3rd congressional district is located in northeastern and central Massachusetts. Massachusetts congressional redistricting after the 2010 census has greatly changed the borders of this congressional district, largely dividing it between the new 2nd and 4th districts, with the new 3rd district covering only a few towns from the old district. Effective with the elections of 2012, Worcester is in the new 2nd district and the new 3rd district is similar to the old 5th district, largely covering the Merrimack valley including Lowell, Lawrence and Haverhill. The district is represented by Democrat Lori Trahan. Cities and towns in the district In Essex County: Precincts 2 through 7 and Precinct 9 in Andover, Haverhill, Lawrence, and Methuen. In Middlesex County: Acton, Ashby, Ayer, Boxborough, Carlisle, Chelmsford, Concord, Dracut, Dunstable, Groton, Hudson, Littleton, Lowell, Marlborough, Maynard, Pepperell, Shirley, Stow, Townsend, Tyngsborough, Westford, and Precinct 1 in Sudbury. In Worcester County: Ashburnham, Berlin, Bolton, Clinton, Fitchburg, Gardner, Harvard, Lancaster, Lunenburg, Westminster, and Precincts 1A, 2 and 3 in Winchendon. Cities and towns in the district 2003–2013 In Bristol County: Attleboro, Fall River (Wards 1–3; Ward 4, Precincts A and B; Ward 5, Precincts A and B; Ward 6, Precincts B and C; and Ward 8, Precinct D), North Attleborough, Rehoboth, Seekonk, Somerset, Swansea. In Middlesex County: Ashland, Holliston, Hopkinton, Marlborough. In Norfolk County: Franklin, Medway, Plainville, Wrentham. In Worcester County: Auburn, Boylston, Clinton, Holden, Northborough, Paxton, Princeton, Rutland, Shrewsbury, Southborough, West Boylston, Westborough, Worcester. Recent election results from presidential races Maps List of members representing the district Recent election results 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Notes References Congressional Biographical Directory of the United States 1774–present National atlas congressional maps External links 2004 election results, via CNN.com 2006 election results, via CNN.com Further reading 03 Government of Bristol County, Massachusetts Government of Middlesex County, Massachusetts Government of Norfolk County, Massachusetts Government in Worcester County, Massachusetts Constituencies established in 1789 1789 establishments in Massachusetts