| Locality | Postal Code |
|---|---|
| Aonocho (井原市) | 715-0012 |
| Biseicho Higashimizusuna (井原市) | 714-1412 |
| Biseicho Hoshida (井原市) | 714-1415 |
| Biseicho Kamikozue (井原市) | 714-1403 |
| Biseicho Kurogi (井原市) | 714-1414 |
| Biseicho Kurotada (井原市) | 714-1407 |
| Biseicho Meiji (井原市) | 714-1401 |
| Biseicho Miyama (井原市) | 714-1406 |
| Biseicho Nishimizusuna (井原市) | 714-1413 |
| Biseicho Okura (井原市) | 714-1411 |
| Biseicho Uto (井原市) | 714-1405, 714-1404 |
| Biseicho Utodani (井原市) | 714-1402 |
| Hieharacho (井原市) | 715-0011 |
| Higashiebaracho (井原市) | 715-0003 |
| Ibaracho (井原市) | 715-0019 |
| Iwakuracho (井原市) | 715-0016 |
| Kamiinagicho (井原市) | 715-0018 |
| Kamiizuecho (井原市) | 715-0021 |
| Kamiizuecho Shikigaoka (井原市) | 715-0026 |
| Kinokocho (井原市) | 715-0004 |
| Kitayamacho (井原市) | 715-0013 |
| Kojirocho (井原市) | 715-0002 |
| Mondencho (井原市) | 715-0005 |
| Nanukaichicho (井原市) | 715-0014 |
| Nishiebaracho (井原市) | 715-0006 |
| Nishigatacho (井原市) | 715-0015 |