The Kingsland family possessed a large tract of land in the area known as Kingsland Manor.

Kingsland is a former post village within the township.

The township is named for Lord Lyndhurst. Finally, on March 27, 1917, the residents of the remaining portions of Union Township passed a referendum to change the name to Lyndhurst Township, which became effective as of May 15, 1917. The borough of North Arlington was created as of March 11, 1896, as the result of a referendum that took place two days earlier. This township was dissolved with the creation of the coterminous Borough of East Rutherford as of March 28, 1894. On April 17, 1889, Boiling Springs Township was created from the northern portion of Union Township. Rutherford Borough was fully separated from the township form of government in 1890 and acquired an additional portion of Union Township in that year. On September 21, 1881, Rutherford became the first borough to be formed under the terms of the New Jersey Legislature's Borough Act of 1878, based on a referendum of voters that passed the previous day. 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. Some of the residents of the northern portion of Harrison Township requested to be returned to Bergen 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. The portion of Lodi Township taken at this time formed the new Harrison Township in Hudson County. 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. On February 22, 1840, Hudson County was formed by an Act of the New Jersey Legislature.

As of the 2020 United States census, the township's population was 22,519, an increase of 1,965 (+9.6%) from the 2010 census count of 20,554, which in turn reflected an increase of 1,171 (+6.0%) from the 19,383 counted in the 2000 census. Lyndhurst is a township in Bergen County, in the U.S.

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