The district was added to the National Register of Historic Places on July 14, 1983, for its significance in agriculture, education, transportation, industry, and religion.

The Old Stone Union Church was built in 1774 from fieldstone and is surrounded by a cemetery.

Located next to the Old Union Church, it is now Washington Township Historical Society Museum.

[5] The Obadiah LaTourette Grist and Saw Mill on the South Branch Raritan River was built around 1750 and owned by Phillip Weise.

[6] The Phillip J. Weisse / J. Schoenheit Farm, known as the Old Fort, is said to have been built around 1774, and was rebuilt in 1876 with Victorian style.