List of postal codes

However, if you provide this dummy code where your address label will be electronically created, the system may change the destination country to "Hong Kong S.A.R, CHINA".

Before the 2007 suspension, the first two letters of a national post code were always 'JM' (for Jamaica) while the third was for one of the four zones (A-D) into which the island was divided.

NO- prefix is used recommended, but not mandatory to be used for international mail to Norway[23] The first digit is assigned regionally (for example, ZIP codes beginning with 9 are found in the western coastal states, Alaska, Hawaii, and islands in the Pacific), and ZIP codes with the same first three digits are served by the same USPS sorting facility (which sometimes serve multiple such groupings), so will be geographically clustered (for example, all ZIP codes in 919XX, 920XX, and 921XX are found in San Diego County, California).

Attempts were also made (without success) to make this part of the official address guidelines of the UPU.

In some cases, the applied country code will differ according to recommendations of the sender's postal administration.