| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Hiraomachi, Yamaguchi (平生町) | 742-1101 |
| Postal/ZIP Codes in Hiraomura, Yamaguchi (平生村) | 742-1102 |
| Postal/ZIP Codes in Oguni, Yamaguchi (小郡) | 742-1112 |
| Postal/ZIP Codes in Okuni, Yamaguchi (尾国) | 742-1113 |
| Postal/ZIP Codes in Onokita, Yamaguchi (大野北) | 742-1105 |
| Postal/ZIP Codes in Onominami, Yamaguchi (大野南) | 742-1106 |
| Postal/ZIP Codes in Others, Yamaguchi (その他) | 742-1100 |
| Postal/ZIP Codes in Saga, Yamaguchi (佐賀) | 742-1111 |
| Postal/ZIP Codes in Sagojima, Yamaguchi (佐合島) | 742-1114 |
| Postal/ZIP Codes in Sone, Yamaguchi (曽根) | 742-1107 |
| Postal/ZIP Codes in Tategahama, Yamaguchi (竪ケ浜) | 742-1103 |
| Postal/ZIP Codes in Usanagi, Yamaguchi (宇佐木) | 742-1104 |
| 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) | |