Hillsborough New Jersey. Hillsborough Township was formally incorporated on February 21, 1798.
Hillsborough is the home of the Belle Mead GSA depot, or Belle Mead General Depot, which was a storage site for materials during World War II, along with housing Italian and German prisoners of war. It continued storing materials until the 1980s, and various contaminants have leaked into the ground and surrounding area during that time, said Tom Miller, counsel for Somerset County.