Navy Region Mid-Atlantic is one of eleven current naval regions responsible to Commander, Navy Installations Command for the operation and management of Naval shore installations in Wisconsin, Illinois, Michigan,Indiana, Ohio, Kentucky, North Carolina, Virginia, West Virginia, Maryland, Delaware, Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, Vermont, New Hampshire, and Maine.

The boundaries of the First Naval District, headquartered at Portsmouth Navy Yard in Kittery, Maine, (and later in Boston, Massachusetts), were established on 7 May 1903 in accordance with General Order No.

In 1919 Puerto Rico was removed from the district and placed directly under the control of the Chief of Naval Operations.

[3] The boundaries of the Fourth Naval District, to be headquartered at League Island Navy Yard in Philadelphia, Pennsylvania, were established on 7 May 1903 in accordance with General Order No.

In 1945 the district, still headquartered in Philadelphia, consisted of the following geographic areas: Pennsylvania, the southern part of New Jersey (including the counties of Burlington and Ocean, and all counties south thereof), and Delaware (including Winter Quarters Shoal Light Vessel).

In 1945 the district was headquartered at the Naval Operating Base at Norfolk, Virginia, and consisted of the following geographic areas: Maryland less Anne Arundel, Prince Georges, Montgomery, St. Mary's, Calvert, and Charles counties; West Virginia; Virginia less Arlington, Fairfax, Stafford, King George, Prince William, and Westmoreland counties; and the Counties of Currituck, Camden, Pasquotank, Gates, Perquimans, Chowan, Tyrrell, Washington, Hyde, Beaufort, Pamlico, Craven, Jones, Carteret, Onslow, and Dare in North Carolina; also the Diamond Shoals Lightship.