| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Nishinagaoka, Iwate (西長岡) | 028-3326 |
| Postal/ZIP Codes in Omaki, Iwate (大巻) | 028-3314 |
| Postal/ZIP Codes in Others, Iwate (その他) | 028-3300 |
| Postal/ZIP Codes in Sahinai, Iwate (佐比内) | 028-3316 |
| Postal/ZIP Codes in Sakuramachi, Iwate (桜町) | 028-3307 |
| Postal/ZIP Codes in Shimomatsumoto, Iwate (下松本) | 028-3446 |
| Postal/ZIP Codes in Shiwachuoekimae, Iwate (紫波中央駅前) | 028-3318 |
| Postal/ZIP Codes in Tochinai, Iwate (栃内) | 028-3322 |
| Postal/ZIP Codes in Toyama, Iwate (遠山) | 028-3535 |
| Postal/ZIP Codes in Tsuchidate, Iwate (土舘) | 028-3453 |
| Postal/ZIP Codes in Yamaya, Iwate (山屋) | 028-3531 |
| Postal/ZIP Codes in Yoshimizu, Iwate (吉水) | 028-3448 |
| Postal Codes in Shiwa | |
|---|---|
| Postal/ZIP Codes in Shiwa (紫波町) | |
| Postal/ZIP Codes in Yahaba (矢巾町) | |