The Board of Supervisors is the governing body of the County of Los Angeles, a charter county.  As such, it has the unique function of serving as the executive and legislative head of the largest and most complex county government in the entire United States.  A civil service staff which performs the duties for the County departments and agencies serves the needs of the County's population of more than 10 million people.

The Executive Office supports the Board of Supervisors in performing its duties as the governing body of the largest local government in the Nation. In this capacity, the staff of the Executive Office prepares the Board's weekly Agenda and  Statement of Proceedings, maintains its official records which date back to the 1850's, and provides technology, accounting, procurement, personnel, payroll, facility management and other administrative services to the Board of Supervisors.