Fair Lawn is a borough in Bergen County, New Jersey, United States. It is a suburb of New York City. As of the 2010 United States Census, the borough's population was 32,457. Fair Lawn was incorporated as a borough by an Act of the New Jersey Legislature on March 6, 1924, as "Fairlawn", from portions of Saddle River Township. The name was taken from Fairlawn, David Acker's estate home, that was built in 1865 and later became the Fair Lawn Municipal Building. In 1933, the official spelling of the borough's name was split into its present two-word form as "Fair Lawn" Borough.