However, Representative Jeff Van Drew of the 2nd district would later change his party affiliation from Democratic to Republican in December 2019, bringing it down to 10–2.

Incumbent Republican Frank LoBiondo, who had represented the district since 1995, announced in November 2017 that he would not run for re-election in 2018 making the 2nd an open seat.

[37] Individuals Organizations A month after the primaries, the National Republican Congressional Committee withdrew its support of Grossman, following the news that he had posted an article from the white nationalist website American Renaissance on his Facebook page stating that blacks represented "a threat to all who cross their paths, black and non-black alike.

"[44] Grossman responded that he had not carefully read the article that he had posted in 2014 and did not believe its racist sentiments, although in explaining his actions he said many black teenagers are violent and dangerous.

[46] Labor unions Organizations Individuals administered Tom MacArthur Republican Andy Kim Democratic The 3rd district is based in South Jersey and includes parts of Burlington and Ocean counties.

Senators State senators State assembly members Organizations Local politicians Individuals Labor unions Organizations Statewide officials State legislators Organizations Mayors County sheriffs County freeholders Municipal council members Individuals County Republican Party organizations Frank Pallone Democratic Frank Pallone Democratic The 6th district is based in Central Jersey and includes parts of Middlesex and Monmouth counties.

Labor unions Organizations Leonard Lance Republican Tom Malinowski Democratic The 7th district includes all of Hunterdon County, and parts of Essex, Morris, Somerset, Union, and Warren Counties.

They included former Assistant Secretary of State for Democracy, Human Rights, and Labor Tom Malinowski;[161] lawyer Goutam Jois;[162] and social worker Peter Jacob.

Green Party of New Jersey member Diane Moxley also announced her intent to run for the seat.

[163] Westfield teacher and attorney Lisa Mandelblatt withdrew in February 2017,[164] as did Scotch Plains lawyer Scott Salmon.

Labor unions Organizations Donald Payne Jr. Democratic Donald Payne Jr. Democratic The 10th district is based in North Jersey and includes parts of Essex, Hudson and Union counties.

Labor unions Rodney Frelinghuysen Republican Mikie Sherrill Democratic The 11th district is based in North Jersey and includes parts of Essex, Morris, Passaic and Sussex counties.

Incumbent Republican Rodney Frelinghuysen, who had represented the district since 1995, announced in January 2018 that he will not seek re-election.

Representatives Statewide officials State senators State Assembly members Labor unions Organizations Newspapers Local officials Individuals County Democratic Party organizations Bonnie Watson Coleman Democratic Bonnie Watson Coleman Democratic The 12th district is based in Central Jersey and includes parts of Mercer, Middlesex, Somerset and Union counties.

Incumbent Democrat Bonnie Watson Coleman, who had represented the district since 2015, ran for re-election.