Postal codes in Iwanai-cho, Iwanai-gun, Hokkaido
北海道岩内郡岩内町 — 13 postal codes. General code: 045-0000. Local government code 01402.
Address example
1-2-3 Aioi, Iwanai-cho, Iwanai-gun, Hokkaido 045-0023, Japan
〒045-0023 北海道岩内郡岩内町相生1-2-3
Replace 1-2-3 with the chome-ban-go (block and lot) number, and add the building and room number before it.
| Postal code | Town / English address |
|---|---|
| 045-0000 | (any other address in this municipality) （下に掲載がない場合） Iwanai-cho, Iwanai-gun, Hokkaido 045-0000, Japan |
| 045-0023 | Aioi 相生 Aioi, Iwanai-cho, Iwanai-gun, Hokkaido 045-0023, Japan |
| 045-0001 | Ohama 大浜 Ohama, Iwanai-cho, Iwanai-gun, Hokkaido 045-0001, Japan |
| 045-0022 | Kiyozumi 清住 Kiyozumi, Iwanai-cho, Iwanai-gun, Hokkaido 045-0022, Japan |
| 045-0011 | Sakae 栄 Sakae, Iwanai-cho, Iwanai-gun, Hokkaido 045-0011, Japan |
| 045-0025 | Shikishimanai 敷島内 Shikishimanai, Iwanai-cho, Iwanai-gun, Hokkaido 045-0025, Japan |
| 045-0013 | Takadai 高台 Takadai, Iwanai-cho, Iwanai-gun, Hokkaido 045-0013, Japan |
| 045-0024 | Nozuka 野束 Nozuka, Iwanai-cho, Iwanai-gun, Hokkaido 045-0024, Japan |
| 045-0002 | Higashiyama 東山 Higashiyama, Iwanai-cho, Iwanai-gun, Hokkaido 045-0002, Japan |
| 045-0003 | Mandai 万代 Mandai, Iwanai-cho, Iwanai-gun, Hokkaido 045-0003, Japan |
| 045-0026 | Misaki 御崎 Misaki, Iwanai-cho, Iwanai-gun, Hokkaido 045-0026, Japan |
| 045-0012 | Miyazono 宮園 Miyazono, Iwanai-cho, Iwanai-gun, Hokkaido 045-0012, Japan |
| 045-0021 | Yamato 大和 Yamato, Iwanai-cho, Iwanai-gun, Hokkaido 045-0021, Japan |
Source: Japan Post postal code data (UTF-8 edition, updated Aug 31, 2026) and romanized edition (KEN_ALL_ROME, June 2025). Japan Post does not claim copyright on postal code data and allows free redistribution. Romaji follows Japan Post (long vowels are not marked). * = romanized by this site from the kana reading because the town is not yet in the romanized edition.