| Locality | Post Code |
|---|---|
| Ki (小諸市) | 384-0805 |
| Ko (小諸市) | 384-0801 |
| Kobara (小諸市) | 384-0001 |
| Kojo (小諸市) | 384-0032 |
| Konyamachi (小諸市) | 384-0015 |
| Kubo (小諸市) | 384-0076 |
| Kumanodo (小諸市) | 384-0024 |
| Matsui (小諸市) | 384-0022 |
| Midorigaoka (小諸市) | 384-0013 |
| Mikage (小諸市) | 384-0091 |
| Mikageshinden (小諸市) | 384-0808 |
| Mimakigahara (小諸市) | 384-0081 |
| Mimitori (小諸市) | 384-0084 |
| Minamicho (小諸市) | 384-0012 |
| Minamigahara (小諸市) | 384-0063 |
| Mitsuwa (小諸市) | 384-0017 |
| Miyazawa (小諸市) | 384-0078 |
| Miyukicho (小諸市) | 384-0005 |
| Moriyama (小諸市) | 384-0085 |
| Moro (小諸市) | 384-0043 |
| Nishibara (小諸市) | 384-0044 |
| Nishiura (小諸市) | 384-0074 |
| Norise (小諸市) | 384-0064 |
| Nukachi (小諸市) | 384-0048 |
| Okubo (小諸市) | 384-0071 |
| Okui (小諸市) | 384-0077 |