| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Others, Yamaguchi (その他) | 740-0000 |
| Postal/ZIP Codes in Sekigahama, Yamaguchi (関ケ浜) | 740-0063 |
| Postal/ZIP Codes in Seta, Yamaguchi (瀬田) | 740-0062 |
| Postal/ZIP Codes in Waki, Yamaguchi (和木) | 740-0061 |
| Postal Codes in Kuga | |
|---|---|
| Postal/ZIP Codes in Waki (和木町) | |