The Rockhill Agricultural Historic District is a 1,075-acre (435 ha) historic district located north of Pittstown along County Route 513 in a southern triangular portion of Union Township in Hunterdon County, New Jersey.

The district was added to the National Register of Historic Places on April 5, 1984, for its significance in agriculture during the 18th and 19th centuries.

The current church building, located in Grandin, New Jersey, was built 1870–1871.

Charles Stewart, an officer during the American Revolutionary War, is buried in the church cemetery.

[3][4] The two and one-half story stone Rock Hill Farm was built around 1747.