| Locality | Post Code |
|---|---|
| Iwadate Sagarimatsu (平川市) | 036-0145 |
| Iwadate Yamanoi (平川市) | 036-0145 |
| Kanaya Kamimatsumoto (平川市) | 036-0202 |
| Kanaya Kamiwaseda (平川市) | 036-0202 |
| Kanaya Nakamatsumoto (平川市) | 036-0202 |
| Kanaya Nakawaseda (平川市) | 036-0202 |
| Kanaya Nishimatsumoto (平川市) | 036-0202 |
| Kanaya Shimomatsumoto (平川市) | 036-0202 |
| Kanaya Shimowaseda (平川市) | 036-0202 |
| Karatake Ashigesawa (平川市) | 036-0132 |
| Karatake Asodake (平川市) | 036-0132 |
| Karatake Hirayama (平川市) | 036-0132 |
| Karatake Horiai (平川市) | 036-0132 |
| Karatake Ichigohara (平川市) | 036-0132 |
| Karatake Izawa (平川市) | 036-0132 |
| Karatake Kawarada (平川市) | 036-0132 |
| Karatake Koganemori (平川市) | 036-0132 |
| Karatake Komatsuhara (平川市) | 036-0132 |
| Karatake Mizukami (平川市) | 036-0132 |
| Karatake Mukaikawarada (平川市) | 036-0132 |
| Karatake Takada (平川市) | 036-0132 |
| Karatake Yakushizawa (平川市) | 036-0132 |
| Kashiwagimachi Fujiyama (平川市) | 036-0104 |
| Kashiwagimachi Higashida (平川市) | 036-0104 |
| Kashiwagimachi Hiroda (平川市) | 036-0104 |
| Kashiwagimachi Yanagida (平川市) | 036-0104 |