Fair Lawn is a borough in Bergen County, New Jersey, United States. As of the United States 2000 Census, the borough population was 31,637. As of 2007, the Census Bureau estimated that the borough had a population of 30,783. 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. Radburn, one of the first planned communities in the United States, is an unincorporated community located within Fair Lawn, and was founded in 1929 as "a town for the motor age".