Eatontown is a borough in Monmouth County, New Jersey, United States. As of the 2010 Census, the borough's population was 12,709, reflecting a decline of 1,299 from the 14,008 counted in the 2000 Census.What is now Eatontown was originally incorporated as Eatontown Township by an act of the New Jersey Legislature on April 4, 1873, from portions of Ocean Township and Shrewsbury Township. Portions of the township were taken to form West Long Branch and Oceanport. Eatontown was reincorporated as a borough on March 8, 1926, replacing Eatontown Township, based on the results of a referendum held on April 13, 1926. The borough was named for Thomas Eaton, an early settler who built a mill c. 1670.The United States Army's Fort Monmouth operated in Eatontown from 1917 until its closure in September 2011, based on recommendations from the Base Realignment and Closure Commission. It was home to the United States Army Materiel Command's Communication and Electronics Command.