California Code, Elections Code - ELEC § 7651

In each county containing more than four Assembly districts or portions thereof, and the City and County of San Francisco, a county central committee shall be elected by Assembly districts, and the number elected shall be that number derived by multiplying 7 times the number of Assembly districts in whole or in part within the county.  The number elected from each Assembly district shall be determined as follows:

The number of voters registered as members of the American Independent Party, as reflected in the statement of voters and their political affiliations transmitted to the Secretary of State on or before the 135th day before any primary election, shall be divided by the total number of members to be elected in the county.  The number thus derived shall be divided into the number of American Independent Party voters registered in each Assembly district or portion thereof, and the integer nearest the resulting quotient shall be the number of central committee members to be elected to represent that Assembly district or portion thereof.