California Code, Government Code - GOV § 26104

The board of supervisors may create a body for the purpose of advising and assisting it in the matter of advertising, exploiting, and making known the resources of the county, for the purposes of this chapter. The body shall be designated by the board as the county board of trade of the county or the county chamber of commerce of the county or such other title as shall be given the body by resolution of the board of supervisors. It shall consist of representatives from the supervisorial districts who shall be appointed by the board of supervisors and hold office at the pleasure of the board of supervisors. The board of supervisors shall determine the number of members of the body, except that the districts must be equally represented and there shall be not more than two members from each district.