The Road Up Raritan Historic District is a 69-acre (28 ha) historic district located along River Road in the township of Piscataway in Middlesex County, New Jersey.

The name is taken from an earlier colonial era name for what was once a Lenape path, Assunpink Trail that became a main road parallel to the river.

[4][5] Piscataway Township itself was formed on December 18, 1666[6] as one of the first seven townships in East Jersey, and is one of the oldest municipalities in the state.

[7] It was added to the National Register of Historic Places on September 18, 1997, for its significance in architecture, military history, and exploration/settlement.

[3] The district includes nine of fourteen historic homes along an approximately 1.2-mile (1.9 km) stretch of River Road.