California Code, Education Code - EDC § 1001

(a) In those counties where the county superintendent of schools has jurisdiction over a school district situated in two or more counties, any qualified elector residing in the part of the school district situated in a county whose county superintendent of schools does not have jurisdiction of that school district shall be eligible to vote for one or more members of the county board of education of the county whose county superintendent of schools has jurisdiction over the school district. Each such elector shall be eligible to vote for the member of the county board of education representing the trustee area of that county having jurisdiction as designated by the county committee on school district organization. The committee shall apportion the portion of the school district territory not situated in the county having jurisdiction to one or more trustee areas of the other county so that that territory shall, insofar as possible, be represented as if it were situated in the county having jurisdiction. The territory so apportioned shall not become a part of the trustee area to which apportioned for any other purpose. As used in this subdivision, “school district” means any joint union elementary school district, joint union high school district, or joint unified school district, but does not include any community college district.

(b) Any person who is a resident of a county and is made eligible to vote for the county board of education of another county pursuant to subdivision (a) shall not be eligible to vote for the county board of education of the county of which he or she is a resident. Notwithstanding the foregoing provisions of this subdivision, a person shall be eligible to vote for both county boards of education if he or she is a resident of an elementary school district of any type that is included in a joint union high school district and the elementary school district and the joint union high school district are each under the jurisdiction of different county superintendents of schools.

(c) “County,” for purposes of this section, includes any county other than a charter county for which the charter specifies that this section does not apply.