| Locality | Postal Code |
|---|---|
| Amakusamachi Fukuregi (天草市) | 863-2806 |
| Amakusamachi Oe (天草市) | 863-2801 |
| Amakusamachi Oeikusagaura (天草市) | 863-2801 |
| Amakusamachi Oemuko (天草市) | 863-1401 |
| Amakusamachi Shimodakita (天草市) | 863-2803 |
| Amakusamachi Shimodaminami (天草市) | 863-2802 |
| Amakusamachi Takahamakita (天草市) | 863-1205, 863-2805 |
| Amakusamachi Takahamaminami (天草市) | 863-2804 |
| Ariakemachi Akasaki (天草市) | 861-7201 |
| Ariakemachi Koshimago (天草市) | 861-7313 |
| Ariakemachi Kotsura (天草市) | 861-7311 |
| Ariakemachi Kusubo (天草市) | 861-7204 |
| Ariakemachi Oshimago (天草市) | 861-7314 |
| Ariakemachi Oura (天草市) | 861-7203 |
| Ariakemachi Shimotsura (天草市) | 861-7312 |
| Ariakemachi Suji (天草市) | 861-7202 |
| Asahimachi (天草市) | 863-2172 |
| Chuoshimmachi (天草市) | 863-0023 |
| Fukamimachi (天草市) | 863-1511 |
| Funenomachi (天草市) | 863-0017 |
| Furukawamachi (天草市) | 863-0025 |
| Futauramachi Hayaura (天草市) | 863-1431 |
| Futauramachi Kameura (天草市) | 863-1432 |
| Goshoramachi Goshora (天草市) | 866-0313 |
| Goshoramachi Makishima (天草市) | 866-0334 |
| Goshoramachi Yokora (天草市) | 866-0303 |