California Code, Vehicle Code - VEH § 38075

(a) The identification certificate shall contain upon the face thereof the date issued, the name and residence or business or mailing address of the owner and of the legal owner, if any, the identification number to the vehicle, and a description of the vehicle as complete as that required in the application for the identification of a vehicle.

(b) The director may modify the form, arrangement, and information appearing on the face of the identification certificate and may provide for standardization and abbreviation of fictitious or firm names thereon whenever he finds that the efficiency of the department will be promoted thereby, except that general delivery or post office box numbers shall not be permitted as the address of the identified owner unless there is no other address.