| Locality | Post Code |
|---|---|
| Obayashi (東根市) | 999-3714 |
| Obayashishinden (東根市) | 999-3715 |
| Omori (東根市) | 999-3712 |
| Onsemmachi (東根市) | 999-3702 |
| Osanagi (東根市) | 999-3737 |
| Osanagi 1-Jodori (東根市) | 999-3756 |
| Osanagi 2-Jodori (東根市) | 999-3755 |
| Osanagi 3-Jodori (東根市) | 999-3754 |
| Osanagi 4-Jodori (東根市) | 999-3753 |
| Osanagi 5-Jodori (東根市) | 999-3752 |
| Osanagidori (東根市) | 999-3751 |
| Osanagi Koji (東根市) | 999-3757 |
| Osanagi Odori (東根市) | 999-3738 |
| Otashinden (東根市) | 999-3728 |
| Others (東根市) | 999-3700 |
| Rokuta (東根市) | 999-3709 |
| Saginomori (東根市) | 999-3703 |
| Saginoshuku (東根市) | 999-3786 |
| Sakuramboekimae (東根市) | 999-3720 |
| Sekiyama (東根市) | 999-3724 |
| Shimaohori (東根市) | 999-3773 |
| Shimogawara (東根市) | 999-3708 |
| Shindemmachi (東根市) | 999-3707 |
| Shiromizu (東根市) | 999-3787 |
| Tosukeshinden (東根市) | 999-3778 |
| Yotsuya (東根市) | 999-3718 |