Hopewell is a borough in Mercer County, in the U.S. state of New Jersey. This historical settlement is located within the heart of the Raritan Valley region. As of the 2020 United States census, the boro…Hopewell is a borough in Mercer County, in the U.S. state of New Jersey. This historical settlement is located within the heart of the Raritan Valley region. 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 reflected a decline of 113 from the 2,035 counted in the 2000 census.
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