The 1st district is located in the north-central part of the state, and is anchored by the state capital of Hartford. It includes parts of Hartford, Litchfield, and Middlesex counties. The incumbent was Democrat John Larson, who had represented the district since 1999. He was re-elected to a tenth term with 64% of the vote in 2016.
The 2nd district is located in the eastern part of the state, and includes all of New London, Tolland, and Windham counties and parts of Hartford, Middlesex, and New Haven counties. The incumbent was Democrat Joe Courtney, who had represented the district since 2007. He was re-elected to a sixth term with 63% of the vote in 2016. The National Republican Congressional Committee outlined this district as one of the 36 Democratic-held districts it was targeting in 2018.[4] Republican gubernatorial nominee Bob Stefanowski won the district in the concurrent gubernatorial election.
Michael P. Meadows, former Republican candidate for Connecticut House of Representatives district 47, Republican State Central Committee Representative district 19, Sprague Republican Town Committee chairman, Sprague Board of Finance member[7]
The 3rd district is located in the central part of the state and contains the city of New Haven and its surrounding suburbs. It includes parts of Fairfield, Middlesex, and New Haven counties. The incumbent was Democrat Rosa DeLauro, who had represented the district since 1991. She was re-elected to a fourteenth term with 69% of the vote in 2016.
The 4th district is located in the southwestern part of the state, extending from Bridgeport, the largest city in the state, to Greenwich. It includes parts of Fairfield and New Haven counties. The incumbent was Democrat Jim Himes, who had represented the district since 2009. He was re-elected to a fifth term with 60% of the vote in 2016.
The 5th district is located in the northwestern part of the state and includes parts of Fairfield, Hartford, Litchfield, and New Haven counties. The incumbent was Democrat Elizabeth Esty, who represented the district since 2013. She was re-elected to a third term with 58% of the vote in 2016. Esty did not run for reelection in 2018.[12] Republican gubernatorial nominee Bob Stefanowski won the district in the concurrent gubernatorial election.