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