Millstone Valley Agricultural District

The Millstone Valley Agricultural District is a historic district located south of Millstone on the western side of the Millstone River along River Road / County Route 533 in Hillsborough Township, Somerset County, New Jersey. The district was added to the National Register of Historic Places on August 10, 1977.

Contributing properties
The Blackwell's Mills Farmhouse was built in the first quarter of the 19th century. The two and one half story building shows Federal style. The Brookie was built early to mid 19th century. It shows Greek Revival style.