Harlingen is an unincorporated community and census-designated place located within Montgomery Township, in Somerset County, in the U.S. state of New Jersey. As of the 2010 United States Census, the CDP's population was 297. It is adjacent to the historical areas of Dutchtown and Bridgepoint. Harlingen Road and U.S. Route 206 intersect in the center of Harlingen. The Harlingen Dutch Reformed Church on Route 206 is extant and had an associated cemetery.