Bancroft Hall Bancroft Hall at the United States Naval Academy in Annapolis , Maryland , is the largest single dormitory in the world . Bancroft Hall , named after former Secretary of the Navy George Bancroft , is home for the entire brigade of 4 , 000 midshipmen , and contains some 1 , 700 rooms , of corridors , and of floor space . All the basic facilities that midshipmen need for daily living are found in the hall . It is referred to as " Mother B " or " The Hall " by Midshipmen . Bancroft Hall was designed by Beaux - Arts architect Ernest Flagg and its central rotunda and first two wings were built in 1901 – 06 . Over the intervening years it has been expanded to encompass eight wings of five stories ( " decks " ) each numbered 0 - 4 . The original two wings are now the 3rd and 4th wings ; the next pair , added in the 1920s , are now the 5th and 6th wings ; a pair added in the late 1930s became the 1st and 2nd wings ; and a final pair were added in the 1960s as the 7th and 8th wings . In addition to the midshipmen rooms , Bancroft Hall houses offices for the Commandant of Midshipmen , six battalion officers , six battalion chaplain s , thirty company officers and their senior enlisted leaders , a barbershop , bank , travel office , a small restaurant known as " Steerage , " textbook store , general store ( " The Midshipmen Store " ) , laundromat , uniform store , cobbler shop , the USNA Band , the USNA branch of the United States Postal Service , a gymnasium , spaces for extracurricular activities , and full medical & dental clinics as well as small optometry and orthopedics clinics . The Hall has its own ZIP code ( 21412 ) . A nine - year renovation project , completed by Whiting - Turner Contracting Co . and RTKL Associates Inc . in 2003 , included of wiring to equip the building with a data communication network . The building also contains King Hall ( named after Fleet Admiral Ernest King ) , where all midshipmen are fed simultaneously three times daily , and Memorial Hall ( see below ) . Memorial Hall and the Rotunda of Bancroft Hall are open to the general public , but access to the rest of the building is normally limited to assigned Naval personnel . There are rooms in Bancroft dedicated to each Academy graduate Medal of Honor recipient in the Navy or Marine Corps . The Rotunda and Memorial Hall . Central to the Hall is the Rotunda , with wings on either side . Over the Rotunda is a large mural of the , during the Battle of the Santa Cruz Islands in World War II . Memorial Hall opens off the Rotunda . This hall contains the honor roll of all Academy graduates who have died in military operations . It includes scrolls and plaques that commemorate alumni and naval personnel lost in battle . There are 489 panes of glass in the skylight . Below Memorial Hall is Smoke Hall whose walls honor those who lost their lives while still Midshipmen . Commander - in - Chief ' s Trophy . The Commander - in - Chief ' s Trophy is awarded to each season ' s winner of the triangular college football series among the United States Naval Academy ( Navy Midshipmen ) , the United States Military Academy ( Army Black Knights ) , and the United States Air Force Academy ( Air Force Falcons ) . When Navy has possession of the trophy , it is displayed in a glass case in the Rotunda .