| Millstone Valley Agricultural District | |
| Nrhp Type: | hd |
| Location: | South of Millstone along River Road / County Route 533, Hillsborough Township |
| Coordinates: | 40.4811°N -74.5806°W |
| Map Label: | Millstone Valley Agricultural District |
| Nocat: | yes |
| Architecture: | Federal, Greek Revival, Late Victorian, Georgian |
| Added: | August 10, 1977 |
| Refnum: | 77000907 |
| Designated Other1 Name: | New Jersey Register of Historic Places |
| Designated Other1 Abbr: | NJRHP |
| Designated Other1 Link: | New Jersey Register of Historic Places |
| Designated Other1 Date: | February 7, 1977 |
| Designated Other1 Number: | 2522[1] |
| Designated Other1 Num Position: | bottom |
| Designated Other1 Color: |
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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.[2]
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.[2] The Brookie was built early to mid 19th century. It shows Greek Revival style.[2]