| Locality | Postal Code |
|---|---|
| Otoguma (小郡市) | 838-0104 |
| Ozaki (小郡市) | 838-0127 |
| Rikitake (小郡市) | 838-0116 |
| Shimoiwata (小郡市) | 838-0123 |
| Shimonishiajisaka (小郡市) | 838-0134 |
| Terafukudo (小郡市) | 838-0138 |
| Tsuko (小郡市) | 838-0102 |
| Yamaguma (小郡市) | 838-0113 |
| Yasaka (小郡市) | 838-0133 |
| Yokoguma (小郡市) | 838-0105 |