Postal codes in Thailand
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Postal codes in Thailand, introduced on 25 February 1982 (Thailand date 2525 B.E.), have 5 digits.
The first two specify the province, the numbers are the same as in ISO 3166-2:TH.
The third and fourth digits specify a district (amphoe).
The fifth digit, if 0, is the main delivering post office for that postal district; if non-zero, is a sub-post office (which receives but does not deliver mail) in that district. The district containing the provincial capital uses xx000 (e.g. Nakhon Ratchasima Province codes are 30xxx, and Nakhon Ratchasima city district is 30000). Generally, each district has its own postcode, although some larger districts are split into two or more postcodes, and some districts share a code. In about half a dozen cases, postcodes overlap province boundaries, to include one or more sub-districts (tambon) that are more easily accessible from the neighbouring province.
