New Jersey's 12th congressional district is represented by Democrat Bonnie Watson Coleman, who has served in Congress since 2015. The district is known for its research centers and educational institutions such as Princeton University, Rider University, The College of New Jersey, Institute for Advanced Study, Johnson & Johnson and Bristol-Myers Squibb. The district is primarily suburban in character, covering portions of Mercer, Somerset, Union, and Middlesex counties, although the district contains the state capital of Trenton as well as the smaller city of Plainfield.

Bonnie M. Watson Coleman is an American politician. She has served as the U.S. representative for New Jersey's 12th congressional district since 2015. She is a member of the Democratic Party. Watson Coleman served in the New Jersey General Assembly, from 1998 to 2015 for the 15th legislative district. She is the first African-American woman to represent New Jersey in Congress.