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10000 is the postcode not 100000.
Even if you got it wrong it would be ignored this end and the address would be followed anyway.
Interesting on how the "External Links" on the bottom for the source of the info actually provide no info or sources for these numbers.
Also it might be just me, but there's a big difference between what's written here and what is actually practiced.
As of the 1st of July I had a package sent from the USA and the postal code that was required was 10,000, not 100,000. I have tried to use the 100,000 and 150,000 postal codes on previous occasions, but they weren't accepted.
This is about as close as I came to anything on the site, Regulations on quality management of postal services but I couldn't find any post codes, mayby you can read it better than Google Translate can, Longh?
I've seen residents use "11111" to get packages from the US to Hanoi - always worked. Probably an old solution to an old problem - I'd place my bets on the 10k answer.
I'm using 10000 always and have used it since I moved in VN. Received packages and important documents thru DHL and FEDEX using this zip. Haven't encountered any problem.
I second Grant's answer from a while ago. It hasn't mattered what number I've used as a postcode when having stuff sent from Oz - and I've used several. If the people at the other end demand a particular postcode, give them what they want. Doesn't make a lick of difference once it arrives on these shores, however.
To get Amazon to deliver here to Hanoi, I used "10 123", but for some unfathomable reason, the space between the 10 & the 123 seemed really important to getting the system to work.
The Wikipedia page's "external sources" links to the VNPost post-code search.
Stick your street name into the box, make sure it's set to "Cụm địa chỉ" and search away. (It ignores diacritics and vowel distinction markers, as far as I can tell.)
Find your street address on the far right (the numbers in square brackets are the street number ranges covered by that postal code) and you've got your post code.
If you know your local post office, type its street name or part thereof into the box, choose "Bưu cục" and it'll give you the post code for that post office.
You can search the address list by post code, but not the list of post offices. So if you want to know where your local post office is, find your post code, then start searching for a post office in your district until you find one with the same post code.
Click "Tất cả" if you want to search by district, village or city, rather than street name.
I've been using 10000 without problem so far, but now that I know where my local post office is (at the end of my street, helpfully) I'm going to start using its post code.
There's no addresses listed for any of 10000, 100000 or 159999 so I guess those post codes trigger a manual lookup of the address in the end, so you're possibly making work for someone else by using them. ^_^
I just found out about this site which gives accurate postal/zip code to your street address, pretty amazing isn't it:
Check it out (: