The postal code system requires all the mails marked by post code numbers beside the address of the addressee indicating their destination, so that the mails can be sorted, culled or mailed by the post code numbers, thereby insuring effective handling of mails and faster delivery service.

This system was started in Noriuch, Great Britain, in October, 1959, for the first time in the world and was quickly spread to many countries around the world. Korea has also been preparing to introduce the system since early 1966 to effectively cope with the daily growing mailing works and will finally come into force effective on coming July 1.

The postal code number consists of five digital numbers with the first one identifying Seoul, one of the provinces; the second one intermediary delivery post office, the third one subintermediary delivery post office and the fourth together with fifth one the last delivery post office.

The Ministry of Communications issues a commemorative postage stamp in celebration of the adoption of the postal code system.