Massachusetts's 4th congressional district

Massachusetts's 4th congressional district is located mostly in southern Massachusetts. It is represented by Democrat Jake Auchincloss. Auchincloss was first elected in 2020.

The district covers much of the area included in the Massachusetts's 10th congressional district before the 1992 redistricting. In prior years, the district stretched from Brookline to Fitchburg. The shape of the district underwent some changes effective from the elections of 2012, after Massachusetts congressional redistricting to reflect the 2010 census. Most of Plymouth County and the South Coast are included in the new 9th district. The new 4th district has expanded westward to include towns along the Rhode Island border that had been in the old 3rd district.

For a very brief time (1793–95) it represented part of the District of Maine.

Geography
There are 35 municipalities in the 4th district, as of the 2021 redistricting. This list is sorted by county.

Bristol County

 * Attleboro
 * Berkley
 * Dighton
 * Fall River
 * Freetown
 * Mansfield
 * North Attleborough
 * Norton
 * Raynham (precincts 2A, 3, and 4 only)
 * Rehoboth
 * Seekonk
 * Somerset
 * Swansea
 * Taunton

Middlesex County

 * Newton
 * Sherborn

Norfolk County

 * Bellingham
 * Brookline
 * Dover
 * Foxborough
 * Franklin
 * Medfield
 * Millis
 * Needham
 * Norfolk
 * Plainville
 * Sharon
 * Wellesley (precincts E and F only)
 * Wrentham

Plymouth County

 * Lakeville

Worcester County

 * Blackstone
 * Hopedale
 * Mendon
 * Milford
 * Millville

Election results

 * CNN.com 2004 election results
 * CNN.com 2006 election results
 * US House of Representatives Clerk's Office, 2006 election results
 * US House of Representatives Clerk's Office, 2008 election results
 * Massachusetts U.S. Congress 2010 Election Results