| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Gotanda, Ibaraki (五反田) | 311-1306 |
| Postal/ZIP Codes in Isohamacho, Ibaraki (磯浜町) | 311-1301 |
| Postal/ZIP Codes in Isomichi, Ibaraki (磯道) | 311-1302 |
| Postal/ZIP Codes in Kamiyamacho, Ibaraki (神山町) | 311-1312 |
| Postal/ZIP Codes in Minatochuo, Ibaraki (港中央) | 311-1305 |
| Postal/ZIP Codes in Naritacho, Ibaraki (成田町) | 311-1313 |
| Postal/ZIP Codes in Onukicho, Ibaraki (大貫町) | 311-1311 |
| Postal/ZIP Codes in Others, Ibaraki (その他) | 311-1300 |
| Postal/ZIP Codes in Sakuramichi, Ibaraki (桜道) | 311-1307 |
| Postal/ZIP Codes in Tokodai, Ibaraki (東光台) | 311-1303 |
| Postal/ZIP Codes in Wado, Ibaraki (和銅) | 311-1304 |
| Postal Codes in Higashiibaraki | |
|---|---|
| Postal/ZIP Codes in Ibaraki (茨城町) | |
| Postal/ZIP Codes in Oarai (大洗町) | |
| Postal/ZIP Codes in Shirosato (城里町) | |