where us raritan nj
Raritan, New Jersey. Raritan is a borough in Somerset County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 6,881, reflecting an increase of 543 (+8.6%) from the 6,338 counted in the 2000 Census, which had in turn increased by 540 (+9.3%) from the 5,798 counted in the 1990 Census.