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.

This township was dissolved with the creation of the coterminous Borough of East Rutherford as of March 28, 1894.

The borough of North Arlington was created as of March 11, 1896, as the result of a referendum that took place two days earlier.

In 1872, the Delaware, Lackawanna and Western Railroad established a railway through the township, and erected a depot in the area named "Kingsland" in honor of the family.

[25] On January 11, 1917, a fire started in Building 30 of the Canadian Car and Foundry Company, in what is now Lyndhurst, in a plant that was producing munitions for sale to the United Kingdom and the Russian Empire during World War I.

Tessie McNamara, who operated the company switchboard, was credited with saving 1,400 lives, contacting each of the buildings and shouting the warning, "Get out or go up!"

[27] The Lyndhurst Historical Society has created a vest pocket park dedicated to the memory of McNamara.

[2][3] Unincorporated communities, localities and place names located partially or completely within the township include Kingsland and South Rutherford.

[30][31][32] The Passaic River, crossed by the Avondale Bridge and the Lyndhurst Draw, creates the municipal and county border at the west.

The eastern portion of the municipality is part of the uninhabited wetlands in the New Jersey Meadowlands.

The 2010 United States census counted 20,554 people, 8,337 households, and 5,394 families in the township.

[46] As of the 2000 United States census[16] there were 19,383 people, 7,877 households, and 5,206 families residing in the township.

[citation needed] Lyndhurst was home to locally owned and operated businesses such as Mazur's Bakery, which closed in 2013.

[52] From 1946 until 1966, Lyndhurst was home to the BUR Barbell Company, the second-largest producer of weight training equipment in the United States.

[54] Town mascot and names include the Lyndhurst Golden Bears/Lyndhurst Post 139/Lyndhurst Cubs American Legion, Cricket, Stellatos, Savinos, I.A.C.L, Bergen County Glass, Carucci, and Century 21 make up Lyndhurst Little League as of 2017.

[55] On July 14, 2006, the Lyndhurst-American Little League baseball team ended their 17-year drought to become district champs.

Throughout the nine district playoff games, Lyndhurst-American hit 14 home runs and eventually emerged as sectional finalists; two wins away from appearing on national television.

[69][70][71] For the 119th United States Congress, New Jersey's 9th congressional district is represented by Nellie Pou (D, North Haledon)[72] New Jersey is represented in the United States Senate by Democrats Cory Booker (Newark, term ends 2027) and Andy Kim (Moorestown, term ends 2031).

[73] For the 2024-2025 session, the 36th legislative district of the New Jersey Legislature is represented in the State Senate by Paul Sarlo (D, Wood-Ridge) and in the General Assembly by Clinton Calabrese (D, Cliffside Park) and Gary Schaer (D, Passaic).

As of 2025[update], the county executive is James J. Tedesco III (D, Paramus), whose four-year term of office ends December 31, 2026.

[75] Bergen County's Commissioners are: Thomas J. Sullivan Jr. (D, Montvale, 2025),[76] Chair Germaine M. Ortiz (D, Emerson, 2025),[77] Joan Voss (D, Fort Lee, 2026),[78] Vice Chair Mary J. Amoroso (D, Mahwah, 2025),[79] Rafael Marte (D, Bergenfield, 2026),[80] Steven A. Tanelli (D, North Arlington, 2027)[81] and Tracy Silna Zur (D, Franklin Lakes, 2027).

[82][83][84][85][86][87][88][89] Bergen County's constitutional officials are: Clerk John S. Hogan (D, Northvale, 2026),[90][91] Sheriff Anthony Cureton (D, Englewood, 2027)[92][93] and Surrogate Michael R. Dressler (D, Cresskill, 2026).

[97] Among the township's 2010 Census population, 56.4% (vs. 57.1% in Bergen County) were registered to vote, including 69.6% of those ages 18 and over (vs. 73.7% countywide).

The department has lost four officers in the line of duty; which is higher than any other municipality in Bergen County.

Lyndhurst Police Auxiliary is headed by Deputy Chief Wayne Alexander.

The department is staffed by 70 fully trained firefighters and responds to an average of 600 calls per year.