Atlantic County, New Jersey

Atlantic County
Atlantic City's boardwalk, the nation's first boardwalk, at night
Location within the U.S. state of New Jersey
New Jersey's location within the U.S.
Coordinates: 39°28′N 74°38′W / 39.47°N 74.64°W / 39.47; -74.64
Country United States
State New Jersey
Founded1837
Named afterAtlantic Ocean
SeatMays Landing
Largest municipalityEgg Harbor Township (population)
Galloway Township (total area)
Hamilton Township (land area)
Government
  County executiveDennis Levinson (R, term ends December 31, 2023)
Area
  Total
671.84 sq mi (1,740.1 km2)
  Land555.51 sq mi (1,438.8 km2)
  Water116.32 sq mi (301.3 km2)  17.3%
Population
 (2020)
  Total
274,534
  Estimate 
(2024)
279,114
  Density410/sq mi (160/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district2nd
Websitehttps://www.atlanticcountynj.gov/

Atlantic County is a county located in the U.S. state of New Jersey. As of the 2020 census, the county was the state's 15th-most-populous county, with a population of 274,534, a drop of 15 from the 2010 census count of 274,549. The United States Census Bureau's Population Estimates Program estimated a 2024 population of 279,114, an increase of 4,580 (+1.7%) from the 2020 decennial census. Its county seat is the Mays Landing section of Hamilton Township. The county is part of the Jersey Shore and of the South Jersey region of the state.

The most populous place in Atlantic County was Egg Harbor Township, with 47,842 residents at the time of the 2020 census; Galloway Township, covered 115.21 square miles (298.4 km2), the largest total area of any municipality, though Hamilton Township has the largest land area, covering 111.13 square miles (287.8 km2). Atlantic County forms the Atlantic CityHammonton metropolitan statistical area, which is also part of the Delaware Valley combined statistical area / Philadelphia metro area.