Hillsborough Township is a Township in Somerset County, New Jersey, United States. As of the 2010 United States Census, the township population was 38,303. Hillsborough Township was originally created by Royal Charter on September 12, 1771, from portions of Western precinct. It was incorporated as one of New Jersey's original 104 townships by an Act of the New Jersey Legislature on February 21, 1798. Portions of the township were taken to form Millstone and Manville . According to the United States Census Bureau, the township has a total area of 54.8 square miles ; 54.7 square miles of it... is land and 0.1 square miles of it is water. In terms of area, it is the largest township in Somerset County. Unincorporated communities located within Hillsborough Township are, [Flagtown, New Jersey|Flagtown]], Neshanic, and South Branch. All of Blackwells Mills is located in Franklin Township. After the three and three quarter mile Route 206 Bypass| U.S. Route 206 Bypass is completed, the town plans to design a town center along the old Business Route 206. Construction for the bypass began in 2010 and be completed by 2017.
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| County: | Somerset County |
| State: | New Jersey |
| Population: | 38,110 |
| Area: | 54.8 sq. mi. |
| Time zone: | North American Eastern Time Zone |
| Also known as: | Hillsborough Township, New Jersey |