If it is required to input postcode of Hong Kong at website(s), you may leave the field blank or try to fill in with "000", "0000", "000000" or "HKG" which are frequently used by others nowadays.
https://www.hongkongpost.hk/en/about_us/tips/postcode/index.html
Hongkong Post - About Postcode in Hong Kong
About Postcode in Hong Kong Purpose of Postcode The main purpose of developing a postcode system is to facilitate the sorting and delivery of mail items with a view to enhancing the efficiency of postal operations. Why Postcode System is not adopted in Hon
www.hongkongpost.hk
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