Six Mile Run is an unincorporated community and census-designated place (CDP) located in Franklin Township, in Somerset County, in the U.S. state of New Jersey.

[1][2] The 2010 United States census counted 3,184 people, 1,152 households, and 820 families in the CDP.

Examples of Six Mile Run Historic District contributing buildings are the three Meadows Foundation maintained properties listed here: Six Mile Run is the historic name for an unincorporated community located within portions of North Brunswick Township and South Brunswick Township in Middlesex County and Franklin Township in Somerset County, in New Jersey.

[11] The name of the settlement was formally changed from Six Mile Run to Franklin Park on June 25, 1872.

In 1970, the land for the reservoir was acquired by the State through the New Jersey Department of Environmental Protection, Division of Water Resources as a future reservoir and recreation area and included many of the properties later listed as contributing to the Six Mile National Register Historic District.

[16] Today the Six Mile Run Reservoir site is maintained as a State Park and includes several trails that are used primarily by mountain bikers, hikers, and horseback riders.

There is a new White Trail, not fully blazed but very usable, running from a left fork off Red Dot near South Middlebush Road, to a parking lot off Jacques Lane.