| Locality | Postal Code |
|---|---|
| Higashiiya Asa (三好市) | 778-0205 |
| Higashiiya Hayashi (三好市) | 778-0203 |
| Higashiiya Imai (三好市) | 778-0206 |
| Higashiiya Kamagatani (三好市) | 778-0203 |
| Higashiiya Kashio (三好市) | 778-0205 |
| Higashiiya Komi (三好市) | 778-0205 |
| Higashiiya Kubo (三好市) | 778-0202 |
| Higashiiya Kuki (三好市) | 778-0203 |
| Higashiiya Kurisudo (三好市) | 778-0203 |
| Higashiiya Kyojo (三好市) | 778-0204 |
| Higashiiya Minokoshi (三好市) | 778-0201 |
| Higashiiya Mottoi (三好市) | 778-0205 |
| Higashiiya Mujuto (三好市) | 778-0205 |
| Higashiiya Nakaue (三好市) | 778-0203 |
| Higashiiya Niiya (三好市) | 778-0205 |
| Higashiiya Nishiyama (三好市) | 778-0203 |
| Higashiiya Ochiai (三好市) | 778-0202 |
| Higashiiya Oeda (三好市) | 778-0204 |
| Higashiiya Ogawa (三好市) | 778-0205 |
| Higashiiya Okunoi (三好市) | 778-0203 |
| Higashiiya Onishi (三好市) | 778-0204 |
| Higashiiya Oshima (三好市) | 778-0206 |
| Higashiiya Sano (三好市) | 778-0206 |
| Higashiiya Shimose (三好市) | 778-0203 |
| Higashiiya Sugeoi (三好市) | 778-0201 |
| Higashiiya Takano (三好市) | 778-0206 |