| Locality | Postal Code |
|---|---|
| Kasanui (飯能市) | 357-0045 |
| Kawadera (飯能市) | 357-0044 |
| Kawasaki (飯能市) | 357-0011 |
| Kitagawa (飯能市) | 357-0201 |
| Koiwai (飯能市) | 357-0066 |
| Kokubo (飯能市) | 357-0015 |
| Kosedo (飯能市) | 357-0067 |
| Koshu (飯能市) | 357-0204 |
| Kuge (飯能市) | 357-0064 |
| Kusumi (飯能市) | 357-0068 |
| Maeganuki (飯能市) | 357-0043 |
| Midoricho (飯能市) | 357-0024 |
| Minami (飯能市) | 357-0214 |
| Minamicho (飯能市) | 357-0036 |
| Minamikawa (飯能市) | 357-0217 |
| Misugidai (飯能市) | 357-0041 |
| Miyazawa (飯能市) | 357-0001 |
| Nagasawa (飯能市) | 357-0203 |
| Nagata (飯能市) | 357-0062 |
| Nagatadai (飯能市) | 357-0061 |
| Nakacho (飯能市) | 357-0038 |
| Nakai (飯能市) | 357-0002 |
| Nakato Kamigo (飯能市) | 357-0121 |
| Nakato Nakago (飯能市) | 357-0122 |
| Nakato Shimogo (飯能市) | 357-0123 |
| Nakayama (飯能市) | 357-0006 |