As of the 2020 United States Census, Harrison’s population was 19,450,[17][18][19][19][20] reflecting an increase of 5,830 (+42.8%) from the 13,620 counted in the 2010 Census, which had in turn decreased by 804 (−5.6%) from the 14,424 counted in the 2000 Census.[21] Once considered “the beehive of industry”, the town is undergoing a residential renewal, particularly along the Passaic River.[22]

Sparta was organized as a township by an act of the New Jersey Legislature on April 14, 1845, from portions of Byram Township, Frankford Township, Hardyston Township and (the now-defunct) Newton Township.[20] The township was named after the existing community of Sparta, which had been settled and named years before,[21] the name likely coming from Sparta, Greece.[22] Ogdensburg borough was incorporated on February 26, 1914, from portions of Sparta Township.[20]

Hawthorne was originally part of the now-defunct Manchester Township, which was later subdivided to create Hawthorne, Haledon, North Haledon, Prospect Park, Totowa, The Heights/Columbia Heights District of Fairlawn and most of the First Ward of Paterson. The Borough of Hawthorne was incorporated from portions of Manchester Township by an act of the New Jersey Legislature on March 24, 1898.[20] The borough was named for novelist Nathaniel Hawthorne.[21][22]

What is now Maple Shade was originally formed as Chester Township on November 6, 1688, and was known as Cropwell Township from June 5, 1690, through February 22, 1699. Chester 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 Cinnaminson Township (March 15, 1860) and Moorestown Township (March 11, 1922). The municipality’s name was changed to Maple Shade Township as of November 6, 1945, based on the results of a referendum passed that same day.[22]

Hazlet is part of the Bayshore Regional Strategic Plan, an effort by nine municipalities in northern Monmouth County to reinvigorate the area’s economy by emphasizing the traditional downtowns, dense residential neighborhoods, maritime history, and the natural environment of the Raritan Bayshore coastline.

According to British colonial records, the first permanent European settlement at Morristown occurred in 1715, when a settlement was founded as New Hanover by colonists from New York and Connecticut. Morris County was created on March 15, 1739, from portions of Hunterdon County. The county, and ultimately Morristown itself, was named for the popular Governor of the Province, Lewis Morris, who championed land ownership rights for colonists.[19][20]

The borough of Palisades Park was created by an act of the New Jersey Legislature on March 22, 1899, from portions of Ridgefield Township. A portion of its area was annexed by the neighboring borough of Fort Lee in April 1909.[24][25][26] The borough was named for its location atop the New Jersey Palisades.[27][28]

Middle Township was formed as a precinct on April 2, 1723, and was incorporated by Township Act of 1798 of the New Jersey Legislature on February 21, 1798 as one of New Jersey’s initial group of 104 townships. Portions of the township have been taken to form Anglesea Borough (on June 13, 1885; now North Wildwood City), Avalon Borough (April 18, 1892), Wildwood (May 1, 1895), Stone Harbor Borough (April 3, 1914) and West Wildwood (April 21, 1920).[22] The township’s name came from its location when Cape May was split into three townships in 1723 at the same time that Lower Township and Upper Township were created.[23]

Jefferson Township was formed as a township by an act of the New Jersey Legislature on February 11, 1804, from portions of Pequannock Township and Roxbury Township.[23][24] The township was named after Thomas Jefferson, the President of the United States at the time the Township was created.[25][26] The township is situated in the northernmost part of Morris County bordering both Passaic and Sussex counties.

Pleasantville was originally incorporated as a borough by an act of the New Jersey Legislature on January 10, 1889, from portions of Egg Harbor Township, based on the results of a referendum held on December 15, 1888. Pleasantville was incorporated as a city on April 14, 1914, replacing Pleasantville borough, based on the results of a referendum held that same day.[17] the city was named by David Ingersoll for its surroundings.[18]