There are multiple bases that make up the Atlantic fleet, such as Mayport FL, Norfolk VA, Pascagoula MI. Any ship that works in the Atlantic Fleet region can be considered part of the Atlantic Fleet.
Traditionally Virginia is the home of the Atlantic Fleet.
The Atlantic Fleet region, or 2nd Fleet AOR (Area Of Responsibility), covers the entire Atlantic Ocean, Carribean, North to South until the Mediteranean Sea and Indian Ocean. The ships making the fleet are stationed at various ports. Any ship operating in the 2nd Fleet AOR can be considered part of the Atlantic Fleet, including ships that come over from the West Coast to the east coast.
Because the Patriots could not field a Navy against the Royal Navy. They did not own a ship and the UK controlled the Atlantic Ocean.
Fleet Command was created in 1999.
The Fringes of the Fleet was created in 1916.
Northern Fleet was created in 1933.
Fleet Buzz was created in 1995.
Baltic Fleet was created in 1702.
Undersea Fleet was created in 1956.
Combined Fleet was created in 1894.
Sydney Fleet was created in 2007.