Jacksonville Beach is a city on the Atlantic coast of Duval County, east of Jacksonville, Florida, United States. It is part of the Jacksonville Beaches communities, together with Mayport, Atlantic Beach, Neptune Beach, and Ponte Vedra Beach. When the city of Jacksonville consolidated with Duval County in 1968, Jacksonville Beach, together with Atlantic Beach, Neptune Beach, and Baldwin, voted to retain their own municipal governments. The population was 21,362 at the 2010 census.