Eatontown is a borough in Monmouth County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 13,597, an increase of 888 (+7.0%) from the 2010 census count of 12,709, which in turn reflected a decline of 1,299 (−9.3%) from the 14,008 counted in the 2000 census.