East Atlantic Beach is a hamlet and census-designated place (CDP) in Nassau County, New York, United States.None of the families and 1.6% of the population were living below the poverty line, including no under eighteens and 2.4% of those over 64.Law enforcement for East Atlantic Beach is provided by the 4th Precinct of the Nassau County Police Department.[5] U.S. Mail Service is provided by the Long Beach Post Office.Although there is no fee, only residents of the hamlet are able to obtain seasonal beach passes for admittance.