Atlantic Beach is a city in Duval County, Florida, United States and allowance of the Jacksonville Beaches communities. When the majority of communities in Duval County consolidated considering Jacksonville in 1968, Atlantic Beach, along past Jacksonville Beach, Neptune Beach, and Baldwin, remained quasi-independent. Like the other towns, it maintains its own municipal government, but its residents vote in the Jacksonville mayoral election and have representation upon the Jacksonville city council. The population was 12,655 at the 2010 census.

In 1900 Henry Flagler built the Mayport branch of the railroad and erected a station north of where the Adele Grage Cultural Center is currently located. Soon afterwards Flagler built a large hotel called the Continental Hotel on the railroad line together with Pablo Beach (Jacksonville Beach) and Mayport. The hotel was a summer resort taking into account 250 guest rooms. There was next a dance pavilion, tennis courts and a fishing pier. In 1913 the railroad sold most of the house to the Atlantic Beach Corporation which then began paving streets, installing lights, and water and sewer lines. In that same year the Continental Hotel tainted its declare to the Atlantic Beach Hotel. However, during World War I people were afraid to take over the coast and the Atlantic Beach Corporation went bankrupt. To make matters worse the Atlantic Beach Hotel burned down upon September 20, 1919. After the war house began to sell again and settlement grew. The Town of Atlantic Beach was incorporated in 1926 and the first charter was adopted in 1929. The first town hall burned by the side of in 1932, so a extra one was built higher that year. The newly usual Mayport Naval Station and the construction of the Mathews Bridge led to additional development of the town. The boundaries of Atlantic Beach were Elongated in 1987 next the annexation of Seminole Beach and anew in 1996 by extending the westerly boundary to the Intracoastal Waterway.

According to the United States Census Bureau, the city has a total Place of 13.0 square miles (33.6 km), of which 3.5 square miles (9.0 km²) is home and 9.5 square miles (24.6 km) (73.07%) is water.

As of the census of 2000, there were 13,368 people, 5,623 households, and 3,643 families residing in the city. The population density was 3,584.3 inhabitants per square mile (1,383.8/km). There were 6,003 housing units at an average density of 1,609.5 per square mile (621.4/km²). The racial makeup of the city was 82.23% White, 12.69% African American, 0.26% Native American, 2.09% Asian, 0.03% Pacific Islander, 1.12% from other races, and 1.58% from two or more races. Hispanic or Latino of any race were 4.18% of the population.