| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Egawa, Ibaraki (江川) | 306-0303 |
| Postal/ZIP Codes in Fuyugi, Ibaraki (冬木) | 306-0305 |
| Postal/ZIP Codes in Harajukudai, Ibaraki (原宿台) | 306-0306 |
| Postal/ZIP Codes in Kawatsuma, Ibaraki (川妻) | 306-0314 |
| Postal/ZIP Codes in Kofukuda, Ibaraki (小福田) | 306-0307 |
| Postal/ZIP Codes in Koshu, Ibaraki (幸主) | 306-0304 |
| Postal/ZIP Codes in Kotesashi, Ibaraki (小手指) | 306-0315 |
| Postal/ZIP Codes in Maebayashi, Ibaraki (前林) | 306-0317 |
| Postal/ZIP Codes in Motokurihashi, Ibaraki (元栗橋) | 306-0313 |
| Postal/ZIP Codes in Ofukuda, Ibaraki (大福田) | 306-0311 |
| Postal/ZIP Codes in Others, Ibaraki (その他) | 306-0300 |
| Postal/ZIP Codes in Sanno, Ibaraki (山王) | 306-0302 |
| Postal/ZIP Codes in Sannoyama, Ibaraki (山王山) | 306-0301 |
| Postal/ZIP Codes in Shaka, Ibaraki (釈迦) | 306-0316 |
| Postal/ZIP Codes in Shinkoya, Ibaraki (新幸谷) | 306-0312 |
| Postal Codes in Sashima | |
|---|---|
| Postal/ZIP Codes in Goka (五霞町) | |
| Postal/ZIP Codes in Sakai (境町) | |