| Place | Post Code |
|---|---|
| 浜 (Hama, Chiba) | 299-5107 |
| 岩和田 (Iwawada, Chiba) | 299-5105 |
| 実谷 (Jikkoku, Chiba) | 299-5114 |
| 上布施 (Kamifuse, Chiba) | 299-5111 |
| 久保 (Kubo, Chiba) | 299-5102 |
| 七本 (Nanamoto, Chiba) | 299-5113 |
| 御宿台 (Onjukudai, Chiba) | 299-5112 |
| その他 (Others, Chiba) | 299-5100 |
| 六軒町 (Rokkemmachi, Chiba) | 299-5104 |
| 新町 (Shimmachi, Chiba) | 299-5103 |
| 須賀 (Suka, Chiba) | 299-5106 |
| 高山田 (Takayamada, Chiba) | 299-5101 |
| Postal Codes in Isumi | |
|---|---|
| Onjuku (御宿町) | |
| Otaki (大多喜町) | |