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There are post codes in Vietnam, believe it or not. Though I doubt any local delivery service actually look at it.

Hanoi post code is in the 100000 range (used to be 10000), Saigon's 700000

Yeah I know that "technically" we have post codes, though I've never met anyone who knows that or knows what their post code is. And I've never received any mail that uses it (not even from the government).

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