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.

As of the census˛ of 2000, there were 252,552 people, 95,024 households, and 63,190 families residing in the county. The population density was 174/km˛ (450/mi˛). There were 114,090 housing units at an average density of 79/km˛ (203/mi˛). The racial makeup of the county was 68.36% White, 17.63% Black or African American, 0.26% Native American, 5.06% Asian, 0.05% Pacific Islander, 6.06% from other races, and 2.58% from two or more races. 12.17% of the population were Hispanic or Latino of any race.