The 1st congressional district is located inwestern andcentral 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 ofSpringfield,West Springfield,Pittsfield,Holyoke, andWestfield. Incumbent DemocratRichard 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 aPVI of D+13.
The 2nd congressional district is located incentral Massachusetts. It contains the cities ofWorcester, which is thesecond-largest city inNew England afterBoston, andNorthampton in thePioneer Valley. Incumbent DemocratJim 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 aPVI of D+8.
The 3rd congressional district is located in northeastern andcentral Massachusetts. It contains theMerrimack valley includingLowell,Lawrence andHaverhill. The incumbent is DemocratNiki 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 aPVI of D+6.
The 4th congressional district is located mostly in southernMassachusetts. It containsBristol,Middlesex,Norfolk,Plymouth andWorcester counties. Incumbent DemocratJoseph 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 aPVI of D+6.
The 5th congressional district is located in eastern Massachusetts. It containsMiddlesex,Suffolk andWorcester counties. Incumbent DemocratKatherine 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 aPVI of D+14.
The 6th congressional district is located in northeasternMassachusetts. It contains most ofEssex County, including theNorth Shore andCape Ann. Incumbent DemocratSeth 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 aPVI of D+4.
The 7th congressional district is located in easternMassachusetts. It contains the northern three-quarters of the city ofBoston, the city ofSomerville and parts of the city ofCambridge. Incumbent DemocratMike 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 aPVI of D+31.
The 8th congressional district is located in easternMassachusetts. It contains the southern quarter of the city ofBoston and many of its southern suburbs. Incumbent DemocratStephen 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 aPVI of D+6.
The 9th congressional district is located in easternMassachusetts, includingCape Cod and theSouth Coast. It contains all ofBarnstable,Dukes andNantucket counties and parts ofBristol andPlymouth counties. Incumbent DemocratBill 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 aPVI of D+5.