Prior to 1916, the area was known as Dundee Lake, a section of Saddle River Township.[4] Residents of the Dundee Lake area voted on April 18, 1916, to secede from Saddle River Township to form the Borough of East Paterson.[3] In 1917, residents of the Rosemont section of Saddle River Township voted to be annexed to East Paterson.[4] In November 1972, residents voted to change the name of the borough to Elmwood Park. The new name became official on January 1, 1973.[4]

The borough had the 10th-highest property tax rate in New Jersey, with an equalized rate of 4.810% in 2020, compared to 3.470% in the county as a whole and a statewide average of 2.279%.[21] Geographically, the borough is part of the South Jersey region.

Millburn was created as a township by an act of the New Jersey Legislature on March 20, 1857, from portions of Springfield Township, when Union County was formed.[24] Earlier known variously as Milltown, Millville, Rum Brook and Vauxhall, the name “Millburn” was adopted before the township was established. The township’s name derives from the burn (Scottish for a stream) that powered mills in the area.[25][26]

New Jersey Monthly magazine ranked Lower Township as its 34th best place to live in its 2008 rankings of the “Best Places To Live” in New Jersey.[21] Geographically, the township is part of the South Jersey region.

Located within the New Jersey Meadowlands, it is the most suburban of the county’s municipalities, though large parts of the town are dedicated to light manufacturing, retail, and transportation uses, as well as protected areas.[24]

West Deptford Township was formed as a township by an act of the New Jersey Legislature on March 1, 1871, from portions of Deptford Township. Portions of the township were taken to form the boroughs of National Park (April 15, 1902) and Westville (April 7, 1914).[21] Woodbury annexed portions of the township in May 1907.[22] The township was named for Deptford, which in turn was named after the English port of Deptford.[23][24]

Vernon is home to Mountain Creek (formerly Great Gorge and Vernon Valley), a ski resort and water park as well as the Crystal Springs Resort’s Minerals Hotel and Elements Spa. The Hidden Valley ski resort, which opened in 1976 and occupied a 140-acre (57 ha) property that included one of New Jersey’s three remaining downhill skiing facilities, closed at the end of the 2013 season and could find no buyers at an auction held that year;[20] it has since reopened as the National Winter Activity Center. The Great Gorge Playboy Club was located in the Vernon community of McAfee, but was sold and turned into a hotel, now called the Legends Resort & Country Club. Opened in 1972 at a cost of $20 million, featuring 700 rooms and 27 holes of golf, the hotel was sold to Americana in 1982 and later was resold to Metairie Corp. which branded the property as the Legends Resort and Country Club. In 2017, the township started eviction proceedings against low-income residents who had been living in the defunct resort on a permanent basis.[21]

Montville was incorporated as a township by an act of the New Jersey Legislature on April 11, 1867, from portions of Pequannock Township.[20][21] It includes the sections of Montville, Pine Brook and Towaco. NJ Transit rail service is available at the Towaco station along the Montclair-Boonton Line.[22]

Hillside was incorporated as a township on April 3, 1913, from portions of Union Township, based on the results of a referendum held on April 29, 1913.[22] The township was named for the surrounding hills.[23]

On February 22, 1840, Hudson County was formed by an Act of the New Jersey Legislature. The newly created county was created from territories that had been Bergen Township since 1691, as well as and from the southern portion of Lodi Township. The portion of Lodi Township taken at this time formed the new Harrison Township in Hudson County. The border between the newly created Harrison Township in Hudson County and the portion of Lodi Township remaining in Bergen County was the New Barbadoes Turnpike, which is now called Paterson Plank Road. Some of the residents of the northern portion of Harrison Township requested to be returned to Bergen County. On February 19, 1852, this area—which had been part of Lodi Township—was returned to Bergen County to become the newly formed Union Township.