| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Toshioka (四万十市) | 787-1105 |
| Postal/ZIP Codes in Tsukurabuchi (四万十市) | 787-0161 |
| Postal/ZIP Codes in Tsunosaki (四万十市) | 787-0016 |
| Postal/ZIP Codes in Unoe (四万十市) | 787-1226 |
| Postal/ZIP Codes in Uyama (四万十市) | 787-0015 |
| Postal/ZIP Codes in Uyamamotomachi (四万十市) | 787-0011 |
| Postal/ZIP Codes in Uyamasatsukicho (四万十市) | 787-0012 |
| Postal/ZIP Codes in Uyamatenjincho (四万十市) | 787-0013 |
| Postal/ZIP Codes in Wakafuji (四万十市) | 787-1104 |
| Postal/ZIP Codes in Warabioka Ko (四万十市) | 787-1442 |
| Postal/ZIP Codes in Warabioka Otsu (四万十市) | 787-1443 |
| Postal/ZIP Codes in Watarigawa (四万十市) | 787-0050 |
| Postal/ZIP Codes in Yamachi (四万十市) | 787-0157 |
| Postal/ZIP Codes in Yasunami (四万十市) | 787-0008 |
| Postal/ZIP Codes in Yokoze (四万十市) | 787-0772 |