The headquarters and most operations are in Washington, D.C., where the staff of approximately 3,480 occupies parts of several different buildings. The main building where the secretary's office is located is Federal Office Building 6 at 400 Maryland Avenue, SW. Additionally, there are 1,360 employees who work in 10 regional offices around the country, each headed by a secretary's regional representative. These offices represent the Department's programs and interests on a regional basis.