| Locality | Post Code |
|---|---|
| Shimohirao (佐久市) | 385-0003 |
| Shimotagiri (佐久市) | 384-0303 |
| Shionada (佐久市) | 384-2102 |
| Taguchi (佐久市) | 384-0412 |
| Takayagi (佐久市) | 385-0042 |
| Tokida (佐久市) | 385-0026 |
| Tokiwa (佐久市) | 385-0032 |
| Tomono (佐久市) | 385-0061 |
| Toridemachi (佐久市) | 385-0043 |
| Tsukabara (佐久市) | 385-0025 |
| Uchiyama (佐久市) | 385-0031 |
| Usuda (佐久市) | 384-0301 |
| Yashima (佐久市) | 384-2105 |
| Yasuhara (佐久市) | 385-0004 |
| Yawata (佐久市) | 384-2106 |
| Yokone (佐久市) | 385-0001 |
| Yokowa (佐久市) | 385-0013 |
| Yomogida (佐久市) | 384-2107 |
| Yuhara (佐久市) | 384-0307 |