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The 1st congressional district is located in western and central Massachusetts. The largest Massachusetts district in area, it covers about one-third of the state and is more rural than the rest. It has the state's highest point, Mount Greylock. The district includes the cities of Springfield, West Springfield, Pittsfield, Holyoke, and Westfield. Incumbent Democrat Richard Neal, who has represented the district since 2013 and previously represented the 2nd district from 1989 to 2013, ran for re-election. He was re-elected unopposed with 98% of the vote in 2014 and the district had a PVI of D+13.
The 2nd congressional district is located in central Massachusetts. It contains the cities of Worcester, which is the second-largest city in New England after Boston, and Northampton in the Pioneer Valley. Incumbent Democrat Jim McGovern, who has represented the district since 2013 and previously represented the 3rd district from 1997 to 2013, ran for re-election. He was re-elected unopposed with 98% of the vote in 2014 and the district had a PVI of D+8.
The 3rd congressional district is located in northeastern and central Massachusetts. It contains the Merrimack valley including Lowell, Lawrence and Haverhill. The incumbent is Democrat Niki Tsongas, who has represented the district since 2013 and previously represented the 5th district from 2007 to 2013. She was re-elected with 63% of the vote in 2014 and the district has a PVI of D+6.
The 4th congressional district is located mostly in southern Massachusetts. It contains Bristol, Middlesex, Norfolk, Plymouth and Worcester counties. Incumbent Democrat Joseph P. Kennedy III, who had represented the district since 2013, ran for re-election. He was elected with 98% of the vote in 2014 and the district had a PVI of D+6.
The 5th congressional district is located in eastern Massachusetts. It contains Middlesex, Suffolk and Worcester counties. Incumbent Democrat Katherine Clark, who had represented the district since 2013, ran for re-election. She was re-elected with 98% of the vote in 2014 and the district had a PVI of D+14.
The 6th congressional district is located in northeastern Massachusetts. It contains most of Essex County, including the North Shore and Cape Ann. Incumbent Democrat Seth Moulton, who had represented the district since 2015, ran for re-election. He was elected with 55% of the vote in 2014 and the district had a PVI of D+4.
The 7th congressional district is located in eastern Massachusetts. It contains the northern three-quarters of the city of Boston, the city of Somerville and parts of the city of Cambridge. Incumbent Democrat Mike Capuano, who had represented the district since 2013 and previously represented the 8th district from 1999 to 2013, ran for re-election. He was re-elected with 98% of the vote in 2014 and the district had a PVI of D+31.
The 8th congressional district is located in eastern Massachusetts. It contains the southern quarter of the city of Boston and many of its southern suburbs. Incumbent Democrat Stephen Lynch, who had represented the district since 2013 and previously represented the 9th district from 2001 to 2013. He was re-elected with 99% of the vote in 2014 and the district had a PVI of D+6.
The 9th congressional district is located in eastern Massachusetts, including Cape Cod and the South Coast. It contains all of Barnstable, Dukes and Nantucket counties and parts of Bristol and Plymouth counties. Incumbent Democrat Bill Keating, who has represented the district since 2013 and previously represented the 10th district from 2011 to 2013, ran for re-election. He was re-elected with 55% of the vote in 2014 and the district has a PVI of D+5.