Even though The Pentagon is located in Arlington Virginia, the United States Postal Service requires that "Washington, D.C." be used in conjunction with the six ZIP Codes assigned to it:
Secretary of Defense | 20301 |
Joint Chiefs of Staff | 20318 |
United States Army | 20310 |
United States Air Force | 20330 |
United States Navy | 20350 |
United States Marine Corps | 20380 |