Maurice River Township was first formed as a precinct on January 19, 1748, and was incorporated by an act of the New Jersey Legislature on February 21, 1798, as one of New Jersey’s initial group of 104 townships. Portions of the township were taken to form Millville on March 1, 1866.[20] The township derives its name from Maurice, Prince of Orange.[21][22]

Fair Haven was incorporated as a borough by an act of the New Jersey Legislature on March 28, 1912, from portions of Shrewsbury Township, subject to the results of a referendum held on April 23, 1912. Portions of the borough were exchanged with Red Bank on June 17, 1957.[21][22]

Dennis Township was incorporated as a township by an act of the New Jersey Legislature on March 1, 1827, from portions of Upper Township. Portions of the township were taken to form Sea Isle City borough (May 22, 1882) and Woodbine borough (March 3, 1903).[19]

New Jersey Monthly magazine ranked Roseland as its 7th best place to live in its 2015 rankings of the “Best Places To Live” in New Jersey.[21] The borough was ranked 14th best place to live in the magazine’s 2008 rankings.[22] In 2017, New Jersey Monthly Ranked Roseland as its 106th best place to live in its 2017 Rankings. New Jersey Monthly magazine ranked Roseland as its 14th best place to live in New Jersey in its 2019 rankings.

New Hanover was originally formed by Royal charter on December 2, 1723, from portions of Chesterfield Township and Springfield Township. New Hanover was incorporated as one of New Jersey’s initial 104 townships by an act of the New Jersey Legislature on February 21, 1798. Portions of the township were taken to form Pemberton borough (December 15, 1826), Pemberton Township (March 10, 1846), North Hanover Township (April 12, 1905) and Wrightstown (March 4, 1918).[19][20]

The borough of Prospect Park was formed by an act of the New Jersey Legislature on March 13, 1901, from portions of the now-defunct Manchester Township.[21][22] The borough was named for Prospect Park, Brooklyn.[23]

Carlstadt was originally formed as a village by an act of the New Jersey Legislature on March 12, 1860, within Lodi Township. Most sources indicate that the community was named for Dr. Carl Klein, the leader of a group of early German settlers who led the project to establish the community[22][23] though Henry Gannett stated that the name derived from the city of Karlovac in Croatia, which was known as “Carlstadt” in German.[24] The Borough of Carlstadt was incorporated on June 27, 1894, formally set off from Bergen Township.[25][26] The borough was formed during the “Boroughitis” phenomenon then sweeping through Bergen County, in which 26 boroughs were formed in the county in 1894 alone.[27]

Watchung was incorporated as a borough by an act of the New Jersey Legislature on May 23, 1926, from portions of North Plainfield Township (now Green Brook Township) based on the results of a referendum held on April 20, 1926.[21][22] The name “Watchung” comes from the Lenni Lenape Native Americans, meaning “high hills”[23] or from “watschu,” meaning “hill.”[24]

Shamong was incorporated as a township by an act of the New Jersey Legislature on February 19, 1852, from portions of Medford Township, Southampton Township and Washington Township. Portions of the township were taken to form Woodland Township (March 7, 1866) and Tabernacle Township (March 22, 1901).[19] In April 1902, portions of Hammonton and Waterford Township were annexed to the township.[20] The township’s name comes from Native American terms meaning “place of the big horn”, from the words oschummo (“horn”) and onk (“place”).[21][22]

The township is one of six municipalities in New Jersey under the name Washington (one of which is a borough, five of which are townships). Washington Township, Warren County completely surrounds the borough of Washington. Mansfield Township, also in Warren County, borders both this municipality and another Washington Township in Morris County.