All five congressional contests in Massachusetts have been won by their Democratic incumbents.
Richard Neal won against independent Frederick Mayock and Libertarian Thomas Simmons for the District 1 seat.
Niki Tsongas won against Republican Ann Wofford, a chemical engineer, in District 3.
Joe Kennedy faced Republican Dave Rosa, an Iraq War veterans and ex-Dighton Parks Commissioner, the District 4 race.
In District 8, Stephen Lynch won his reelection against challenger Republican William Burke, a businessman with a resume that includes computer programmer and laborer.
William Keating won against four challengers in District 9: Republican Mark Alliegro; independent Christopher Cataldo; independent Paul Harrington; and independent Anna Grace Raduc.
Massachusetts' four other congressional members - Jim McGovern, Katherine Clark, Seth Moulton and Mike Capuano - are also up for re-election without challengers.
Polls closed at 8 p.m. in Massachusetts.