Postal codes in Taiwan

Postal codes in Taiwan is a system of three + three digits used by Chunghwa Post. There are 368 sets of three-digit codes for townships, county-administered cities, and districts in Taiwan.

The cities of Chiayi and Hsinchu have a single code covering all their districts. The uninhabited islands Pratas (Dongsha) and Spratly (Nansha) each have a single code. The uninhabited Senkaku Islands (Diaoyutai) (administered by Japan) have a code, but there are no deliveries.

Omitting the supplementary three digits is ordinarily acceptable, especially for general public, while using a six-digit code is expected for corporate customers who send large-volume mails, which will speed the delivery of the mail.

Change from 3+2 to 3+3 postal codes
The official launch of three + three digit postal codes occurred on March 3, 2020, in order to support more fine grained delivery section codes. For example, a bank with a high volume of mail or a community with a mailroom could have a unique code.

The initial three digit division codes remain unchanged, only the supplemental two digits were updated to three digits. The previous three + two digit system had been in service for 29 years, since February 1, 1991.

As of November 2020, three + two digit postal codes are still in common use and accepted by the post office. A significant proportion of forms and systems provide space for only three + two digit postal codes.

There are apps for Android and iOS/iPadOS to look up the 3+3 postal codes.

Large Postal Code Zones
The first digit is for a large postal zone: