Fairfield Township, Essex County, New Jersey

Fairfield is a township in far northwestern Essex County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 7,872, an increase of 406 (+5.4%) from the 2010 census count of 7,466, which in turn reflected an increase of 403 (+5.7%) from the 7,063 counted in the 2000 census. Fairfield was the least densely populated town in Essex County in 2020.

The first Europeans to settle in the area were Dutch and the place was called Gansegat. Later it was part of Horse Neck and officially part of Newark Township. What is now Fairfield was formed on February 16, 1798, as Caldwell Township from portions of Acquackanonk Township and Newark Township. The area was named for Rev. James Caldwell. It 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 create Livingston (February 8, 1813), Fairmount Township (March 11, 1862, now part of West Orange), Caldwell borough (February 10, 1892), Verona Township (February 17, 1892, now known and including what is now Cedar Grove), North Caldwell (March 31, 1898), Essex Fells (March 31, 1902) and West Caldwell (February 24, 1904). On November 6, 1963, Caldwell Township was renamed as Fairfield Township, based on the results of a referendum passed the previous day. Fairfield was reincorporated as borough on June 8, 1964. In 1978, the borough passed a referendum reincorporating itself as a township, becoming the second of more than a dozen Essex County municipalities to reclassify themselves as townships in order take advantage of federal revenue sharing policies that allocated townships a greater share of government aid to municipalities on a per capita basis.