What is the contact information of pentagon building? The contact information like email address, telephone number, website and postal cum official address of Pentagon Building is mentioned in below section. The address of Pentagon Building is 1400 Defense Pentagon Washington, DC, United States. The contact number of Pentagon Building is +1 (703) 697-1776. Where can i get a doctors appointment near the pentagon? Closed All Federal Holidays. Located on the outer edge of the Pentagon, just inside the Corridor 8 entrance, the DiLorenzo TRICARE Health Clinic offers normal medical appointments, a full service Pharmacy, and a Dental Clinic (both listed separately). Terrible!What is the pentagon library and what does it do? The Pentagon Library serves the information needs of offices of the Secretary of Defense, Joint Chiefs of Staff, and Military Departments located at the Pentagon. The Library traces its history back to 1800, when the War Department Library was established.How many people work in the pentagon? The Pentagon houses more than 25,000 Department of Defense employees - military, civilian, and contractors. The Secretary of Defense and the Joint Chiefs of Staff have their offices in the building. It has 5 rings, with the inner-most ring opening up into a large courtyard with a small restaurant in the middle.