Incumbent Democrat John B. Larson, who had represented the district since 1999, ran for re-election. He was re-elected with 58% of the vote in 2014. The district had a PVI of D+13.
Incumbent Democrat Joe Courtney, who had represented the district since 2007, ran for re-election. He was re-elected with 62% of the vote in 2014. The district had a PVI of D+5.
Incumbent Democrat Rosa DeLauro, who had represented the district since 1991, ran for re-election. She was re-elected with 67% of the vote in 2014. The district had a PVI of D+11.
Incumbent Democrat Jim Himes, who had represented the district since 2009, ran for re-election. He was re-elected with 51% of the vote in 2014. The district had a PVI of D+5.
Incumbent Democrat Elizabeth Esty, who had represented the district since 2013, ran for re-election. He was re-elected with 50% of the vote in 2014. The district had a PVI of D+3.