In Taiwan, a system of postal codes of three + two digits are used by Chunghwa Post.[1] There are 368 sets of three-digit codes for rural townships, urban townships, county-controlled cities, districts (Hsinchu City and Chiayi City have districts coded 300 and 600 respectively without three-digit subdivisions), and the uninhabited island groups of Pratas Islands, Spratly Islands, and Diaoyutai Islands (claimed by the ROC, currently controlled by Japan). Omitting the supplementary two digits is ordinarily acceptable, but a five-digit code will speed up the mail.
The first digit is for a large postal zone, as follows:
| First digit | Cities | Counties | Subsidiary islands |
|---|---|---|---|
| 0 | Unused | ||
| 1 | Taipei City | ||
| 2 | New Taipei City, Keelung City | Yilan County, Lienchiang County (Matsu) | Diaoyutai Islands |
| 3 | Hsinchu City | Hsinchu County, Taoyuan County, Miaoli County | |
| 4 | Taichung City | ||
| 5 | Changhua County, Nantou County | ||
| 6 | Chiayi City | Chiayi County, Yunlin County | |
| 7 | Tainan City | ||
| 8 | Kaohsiung City | Penghu County, Kinmen County | Pratas Islands, Spratly Islands |
| 9 | Pingtung County, Taitung County, Hualien County | ||
Please see List of postal codes in Taiwan for detail.
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