Atlantic Beach is a city in Duval County, Florida, United States. When the majority of communities in Duval County consolidated with Jacksonville, Florida in 1968, Atlantic Beach, along with Jacksonville Beach, Neptune Beach, Ponte Vedra Beach and Baldwin, Florida, 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 on the Jacksonville city council. The population was 13,368 at the 2000 census. According to the U.S Census estimates of 2005, the city had a population of 13,436. 