The Client Security Services Division consists of all field security offices.

The field security offices shall be responsible for providing security oversight to operating units; coordinating searches, evacuations, and other procedures to protect persons, property and information; overseeing the emergency responses and investigations of security incidents at all Departmental facilities; developing, implementing, and maintaining a program of reviews throughout the Department to ensure appropriate compliance with all security policies promulgated by OSY; conducting a comprehensive security education and awareness program to enhance employee knowledge of security requirements; facilitating requests for personnel security clearances for job applicants, employees, and other individuals requiring access to classified national security information at any Department location worldwide; and reviewing suitability investigations for contractors of the Department.

Each field security office maintains a webpage for developed specifically for their clients:

HCHB - Office of Security at the Herbert C. Hoover Building, Washington, D.C.

Census-Suitland - Office of Security at Census, Suitland, MD

Census-Jeffersonville - Office of Security at the National Processing Center, Jeffersonville, IN

NOAA - Office of Security at NOAA, Silver Spring, MD

NIST - Office of Security at NIST, Gaithersburg, MD

ERSO - Eastern Regional Security Office, Norfolk, VA

MRSO - Mountain Regional Security Office, Boulder, CO

WRSO - Western Regional Security Office, Seattle, WA