| Locality | Post Code |
|---|---|
| Osachigongencho (岡谷市) | 394-0081 |
| Osachigosho (岡谷市) | 394-0082 |
| Osachiizuhaya (岡谷市) | 394-0089 |
| Osachikatamacho (岡谷市) | 394-0084 |
| Osachikohagi (岡谷市) | 394-0085 |
| Osachiminamoto (岡谷市) | 394-0086 |
| Osachinashikubo (岡谷市) | 394-0088 |
| Osachishibamiya (岡谷市) | 394-0083 |
| Osachishizume (岡谷市) | 394-0087 |
| Others (岡谷市) | 394-0000 |
| Saiwaicho (岡谷市) | 394-0029 |
| Shimmeicho (岡谷市) | 394-0004 |
| Tanakacho (岡谷市) | 394-0031 |
| Tenryucho (岡谷市) | 394-0035 |
| Tsukamacho (岡谷市) | 394-0026 |
| Uchiyama (岡谷市) | 394-0055 |
| Wakamiya (岡谷市) | 394-0032 |
| Yamashitacho (岡谷市) | 394-0005 |
| Yamatecho (岡谷市) | 394-0041 |
| Yogitogisawa (岡谷市) | 394-0053 |