Hopewell is a borough in Mercer County, in the U.S. state of New Jersey. Centrally located within the Raritan Valley region, this historical settlement is an exurban commuter suburb of New York City in the New York metropolitan area as defined by the United States Census Bureau. As of the 2020 United States census, the borough's population was 1,918, a decrease of 4 from the 2010 census count of 1,922, which in turn had reflected a decline of 113 from the 2,035 counted at the 2000 census.