| Locality | Postal Code |
|---|---|
| Akahane (岡谷市) | 394-0002 |
| Ashinosawa (岡谷市) | 394-0053 |
| Chuocho (岡谷市) | 394-0027 |
| Daieicho (岡谷市) | 394-0025 |
| Enrei (岡谷市) | 394-0051 |
| Ginza (岡谷市) | 394-0022 |
| Goda (岡谷市) | 394-0021 |
| Hannoki (岡谷市) | 394-0054 |
| Higashiginza (岡谷市) | 394-0023 |
| Hizawa (岡谷市) | 394-0056 |
| Honcho (岡谷市) | 394-0028 |
| Horinochi (岡谷市) | 394-0024 |
| Imai (岡谷市) | 394-0001 |
| Kamocho (岡谷市) | 394-0003 |
| Kawagishihigashi (岡谷市) | 394-0045 |
| Kawagishikami (岡谷市) | 394-0048 |
| Kawagishinaka (岡谷市) | 394-0047 |
| Kawagishinishi (岡谷市) | 394-0046 |
| Kohan (岡谷市) | 394-0034 |
| Minato (岡谷市) | 394-0044 |
| Nangu (岡谷市) | 394-0033 |
| Narutacho (岡谷市) | 394-0042 |
| Nishibayashi (岡谷市) | 394-0052 |
| Okayashinotsuginibanchigakurubaai (岡谷市) | 394-0091 |
| Okuracho (岡谷市) | 394-0043 |
| Osachi (岡谷市) | 394-0011 |