| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Iwaishima, Yamaguchi (祝島) | 742-1401 |
| Postal/ZIP Codes in Murotsu, Yamaguchi (室津) | 742-1403 |
| Postal/ZIP Codes in Nagashima, Yamaguchi (長島) | 742-1402 |
| Postal/ZIP Codes in Others, Yamaguchi (その他) | 742-1400 |
| Postal/ZIP Codes in Yashima, Yamaguchi (八島) | 742-1404 |
| Postal Codes in Kumage | |
|---|---|
| Postal/ZIP Codes in Hirao (平生町) | |
| Postal/ZIP Codes in Kaminoseki (上関町) | |
| Postal/ZIP Codes in Tabuse (田布施町) | |