Massapequa is a hamlet in the southern part of the Town of Oyster Bay, Nassau County, NY. Adjacent to Amityville (Suffolk County), Massapequa has a population of almost 22.000 residents. Famous for being the hometown of Joey Buttafuoco in the 1990's, Massapequa covers 4.0 square miles, 3.7 of which is land and the rest of 0.3 square miles water.