Naval Support Activity Mechanicsburg is a 806 acres (1.259 sq mi) naval supply depot just outside of Mechanicsburg in Cumberland County, Pennsylvania. Largely industrial, and home to over 150 warehouses containing 8,800,000 square feet (820,000 m2) of storage space and other buildings, it is the headquarters of the Naval Supply Systems Command, which is located at the intersection of 3rd and K Streets on the installation. It is also the parent installation of Naval Support Activity Philadelphia and the Philadelphia Navy Yard, which share the same commanding officer.