Assessor Department Contact Information Assessor Department Main Line Open Monday through Friday from 8:00 AM to 5:00 PM. 714-834-2727 Address Changes 714-834-2939 Assessor Parcel Maps 714-834-2727 Boats & Aircraft 714-834-2772 Business Personal Property 714-834-2930 Change of Ownership 714-834-5031 Exemptions - Homeowners' 714-834-3821 Exemptions - Institutional 714-834-2779 Exemptions - Veterans' 714-834-5945...