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is a borough in Sussex County, New Jersey, in the United States. As of the United States 2000 Census, the borough population was 845. The borough is located in the northernmost region of Sussex County.
Branchville was incorporated as a borough by an Act of the New Jersey Legislature on March 9, 1898, from portions of Frankford Township. An additional portion of Frankford Township was annexed as of March 1, 1951.
Branchville was settled by immigrants from Connecticut in the 1700s. It grew quickly and in the 1820s the town was divided into building lots. By the year 1844 Branchville was a well established community with 32 dwellings, mills, blacksmiths, an academy, a church and a variety of other factories and businesses.
The addition of two water-powered mills and a dam in 1855 furthered the town's prosperity. Energy would later be harnessed from this dam and a second one that was built to supply Branchville with electricity and its own power company.
Extension of rail service to Branchville in 1869 brought and even greater boon to the village's economic market growth. From 1869-1871 forty new homes were built. The railroad had made it possible to ship products from the local mills and creameries to larger urban areas to the east. With lake communities nearby the tourism was also spurred by the railroad. Up to six trains a day would bring people from the larger cities to enjoy a country vacation.