Atlantic County is a county located in the U.S. state of New Jersey. As of the 2000 Census, the population is 252,552. Its county seat is Mays Landing.
All of what is known today as Atlantic County was once called Egg Harbor Township, the eastern half of the original County of Gloucester. Named as an official district as early as 1693, it was bounded on the north by the Little Egg Harbor River (now known as the Mullica River), and on the south by the Great Egg Harbor River and its southern branch the Tuckahoe River. Its eastern boundary was the Atlantic Ocean, but the western boundary in the South Jersey interior was not fixed until 1761.