Hillsborough is a census-designated place (CDP)[5] located in the center of Hillsborough Township, Somerset County, in the U.S. state of New Jersey.

[4] The CDP is in south-central Somerset County and is bordered to the northwest by Flagtown, to the west by Neshanic, and to the south by Belle Mead.

U.S. Route 206 passes through the community, leading north 5 miles (8 km) to Somerville, the county seat, and south 12 miles (19 km) to Princeton.

As of the 2020 United States census, the area had a population of 22,214.

This Somerset County, New Jersey state location article is a stub.