| Locality | Post Code |
|---|---|
| Akahama (筑西市) | 300-4523 |
| Araishinden (筑西市) | 300-4516 |
| Arita (筑西市) | 300-4512 |
| Asahigaoka (筑西市) | 308-0836 |
| Chigyo (筑西市) | 309-1124 |
| Chikuze (筑西市) | 308-0074 |
| E (筑西市) | 308-0128 |
| Ebie (筑西市) | 300-4538 |
| Ebigashima (筑西市) | 300-4517 |
| Fujigaya (筑西市) | 308-0112 |
| Fukami (筑西市) | 308-0812 |
| Funadama (筑西市) | 308-0121 |
| Funyu (筑西市) | 308-0111 |
| Furuchi (筑西市) | 300-4544 |
| Furugori (筑西市) | 309-1104 |
| Goshomiya (筑西市) | 308-0866 |
| Hagata (筑西市) | 308-0014 |
| Haitsuka (筑西市) | 308-0863 |
| Hanabashi (筑西市) | 308-0115 |
| Hanada (筑西市) | 308-0114 |
| Hasunuma (筑西市) | 309-1115 |
| Hatta (筑西市) | 308-0013 |
| Hayashi (筑西市) | 308-0073 |
| Hei (筑西市) | 308-0031 |
| Higashihozue (筑西市) | 300-4536 |
| Higashiishita (筑西市) | 300-4521 |