Weston is a census-designated place and unincorporated community located in Franklin Township, in Somerset County, New Jersey, United States. As of the 2010 United States Census, the CDP's population was 1,235. Situated on the east side of the Millstone River north of East Millstone and south of Zarephath (which has grown to include some of the area once considered Weston), early names used for the area were Schenck's Mill, Van Neste's Mill and Frogtown. Historically, an area on the west side of the river in what is now part of the borough of Manville was also referred to as Weston. The Weston Causeway is the only bridge across the Millstone River between East Millstone and the confluence with the Raritan River near South Bound Brook.