New Jersey's 4th congressional district is a congressional district that stretches along the New Jersey Shore.

It has been represented by Republican Chris Smith since 1981, the second-longest currently serving member of the US House of Representatives and the longest serving member of Congress from New Jersey in history.

Although the 4th district had a presence in Mercer County for decades, it lost its two municipalities in the county (Hamilton Township and Robbinsville Township) following the redistricting process in late 2021, which was based on the 2020 census.

With a Cook Partisan Voting Index rating of R+14, it is the most Republican district in New Jersey,[2] and it is also the only one that did not elect a Democrat since 2018.

[3] For the 118th and successive Congresses (based on redistricting following the 2020 Census), the district contains all or portions of two counties and 40 municipalities.