The 1761 Milestone is a mile marker located at 640 South Main Street in Woonsocket, Rhode Island. The stone originally marked the junction of a Colonial highway from Great Road and an east-west route from Boston, Massachusetts to Connecticut. It was rediscovered during the installation of an electrical road (likely a tram). In 1898, it was restored to its original location by the local chapter of the Daughters of the American Revolution. The stone is embedded in a low retaining wall at the corner of South Main Street and Smithfield Road. It was added to the National Register of Historic Places on November 24, 1982, and is historically significant as a Colonial-era highway marker.