Harlingen is an unincorporated community and census-designated place (CDP)[9] located within Montgomery Township, in Somerset County, in the U.S. state of New Jersey.

According to the United States Census Bureau, Harlingen had a total area of 0.717 square mile (1.858 km2), all of which was land.

[1][2] The 2010 United States census counted 297 people, 93 households, and 81 families in the CDP.

[14] The Harlingen Dutch Reformed Church is in the Belle Mead, New Jersey section of Montgomery Township.

The congregation was organized in 1727, and the minister was one of the major antagonists in the dispute between the traditionalists and the American party that contested governance of the Dutch Reformed Church.