Add Custom Fields to User Profile in WordPress

Place the following code in your functions.php file to add custom fields to the user profile page in WordPress:

function my_custom_userfields( $contactmethods ) {

        $contactmethods['contact_phone_office']     = 'Office Phone';
        $contactmethods['contact_phone_mobile']     = 'Mobile Phone';
        $contactmethods['contact_office_fax']       = 'Office Fax';
    
        $contactmethods['address_line_1']       = 'Address Line 1';
        $contactmethods['address_line_2']       = 'Address Line 2 (optional)';
        $contactmethods['address_city']         = 'City';
        $contactmethods['address_state']        = 'State';
        $contactmethods['address_zipcode']      = 'Zipcode';
   }
   add_filter('user_contactmethods','my_custom_userfields',10,1);

For a more advanced approach to custom fields, see Beginner’s Guide to Advanced Custom Fields.