Hong Kong ZIP Code: There Isn't One. What to Enter Instead

Hong Kong has no ZIP code and no postcode. That is not an oversight or a gap in a database; it is policy. Hongkong Post's own page on the subject says the postcode system 'is not adopted in Hong Kong' and that it has no plan to introduce one ^{[hkpost-postcode]}. This page gives Hongkong Post's answer to the mandatory field and explains where the number 999077 comes from. It then sets out the address format from the Post Office Guide and ends with the rules a form should follow.

What to enter when a form demands a postcode

Hongkong Post answers this directly. If a form or an overseas sender requires a postcode, 'you may leave the field blank or try to fill in with 000, 0000, 000000 or HKG' ^{[hkpost-postcode]}. That is the whole official position. The values differ only in length, so pick the one that passes the form's validation.

Where 999077 comes from

Search for a Hong Kong postcode and you will find 999077 repeated across shipping blogs. It is real, but it is not Hong Kong's. China Post allocated it as part of the 9-series codes it uses for international and interregional mail sent from mainland China, and it is only used sporadically on mail posted from the mainland ^{[wiki-hk-postal]}. Hongkong Post does not use it and does not operate on the mainland, so most people in Hong Kong have never seen it.

There is a practical reason to avoid it too. The international list of postal codes carries a warning: if you provide 999077 where the address label will be created electronically, 'the system may change the destination country to Hong Kong S.A.R, CHINA' ^{[wiki-postal-list]}. That can mean a different rate, a different customs route and a different carrier. A blank field, or 000000, does none of that.

Why Hongkong Post never introduced postcodes

The reasons are on the record. Hongkong Post's mechanised letter sorting system 'is capable of identifying over 90% of mail items' with printed or written English addresses and printed Chinese addresses, so a postcode would add little. And because the city packs about three million addresses into a small area, a postcode fine enough to be useful would run to 15 digits, which Hongkong Post judged 'not user-friendly' ^{[hkpost-postcode]}. Delivery performance is high without a code, so the decision stands.

This puts Hong Kong in a small group. Macau and the United Arab Emirates run without postal codes as well, and Ireland only introduced one in 2015. The postal code formats worldwide post compares them; the UAE page covers the same form problem for Dubai.

How a Hong Kong address is written

Without a postcode, the address itself carries the routing. Section 6.1 of Hongkong Post's Post Office Guide lists six elements a local address 'should always include', in this order ^{[hkpost-guide]}.

Three details matter for a form. The flat and floor share a line, written 'Flat 25, 12/F', and the floor uses the /F suffix. The district and the region are both in capitals, and the region is one of exactly three: Hong Kong, meaning the island, Kowloon, or New Territories. And there is no country line on local mail, because the last line already says where it is. The guide also asks for no more than 32 characters per line and no punctuation except a comma between two components on one line ^{[hkpost-guide]}.

A PO Box address drops the building and street: the guide's example is 'Mr. WONG Yat-ming, P.O. Box 42345, CAUSEWAY BAY POST OFFICE, HONG KONG', with the post office name in capitals ^{[hkpost-guide]}. For rural parts of the New Territories, where a street may not exist, the village name takes the place of the street line.

Every recipient, building and box number above is invented. The streets and districts are real, because a form has to cope with real district names in capitals and real street names with 'Central' or 'West' on the end. Fakenamely's Hong Kong identity generator produces addresses in the same shape, and its postal code field is blank on purpose. The underlying locale data throws an error if you ask it for a Hong Kong postcode, because there is none to give.

Rules for a form that accepts Hong Kong addresses

1. Make the postal code optional when the country is HK. Better, hide it. A required postcode field for Hong Kong is a bug, not a validation.
2. If the schema needs a value, store an empty string. Do not store 000000 or HKG as if it were data, and never pre-fill 999077.
3. Accept 000, 0000, 00000, 000000 and HKG without an error, and do not run them through a numeric or US ZIP check.
4. Offer a region field with three values: Hong Kong, Kowloon, New Territories. It replaces the state field, and it is mandatory.
5. Accept a district in the address. There are 18 districts across the three regions ^{[wiki-hk-districts]}; a free-text field is enough, and capitals are conventional, not required by the form.
6. Allow a flat, floor and block on one line. '12/F' has a slash; 'Flat 2103' and 'Block B' are ordinary; do not split them into numeric fields.
7. Keep 32 characters per line as a soft limit if you print labels, following the Post Office Guide, and let long building names wrap rather than truncating them.

Where this fits on the site

The random address generator covers Hong Kong through the Hong Kong identity page, which is the one country page on the site whose postal field is empty by design. The mirror-image problem, a US ZIP code that starts with zero and keeps being shortened to four digits, has its own page: ZIP codes that start with 0. For the basics of how codes work where they exist, start with what a ZIP code is.

Method note: the official position and the placeholder values are quoted from Hongkong Post's postcode page ^{[hkpost-postcode]}. The address elements and examples come from section 6.1 of its Post Office Guide, dated January 2025 ^{[hkpost-guide]}. Both were read on 2026-09-07. The origin of 999077 and the label warning come from Wikipedia ^{[wiki-hk-postal] [wiki-postal-list]}. If Hongkong Post changes its advice, its page wins over this one.