Postal codes in Onjuku-machi, Isumi-gun, Chiba
千葉県夷隅郡御宿町 — 12 postal codes. General code: 299-5100. Local government code 12443.
Address example
1-2-3 Iwawada, Onjuku-machi, Isumi-gun, Chiba 299-5105, Japan
〒299-5105 千葉県夷隅郡御宿町岩和田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 |
|---|---|
| 299-5100 | (any other address in this municipality) （下に掲載がない場合） Onjuku-machi, Isumi-gun, Chiba 299-5100, Japan |
| 299-5105 | Iwawada 岩和田 Iwawada, Onjuku-machi, Isumi-gun, Chiba 299-5105, Japan |
| 299-5112 | Onjukudai 御宿台 Onjukudai, Onjuku-machi, Isumi-gun, Chiba 299-5112, Japan |
| 299-5111 | Kamifuse 上布施 Kamifuse, Onjuku-machi, Isumi-gun, Chiba 299-5111, Japan |
| 299-5102 | Kubo 久保 Kubo, Onjuku-machi, Isumi-gun, Chiba 299-5102, Japan |
| 299-5114 | Jikkoku 実谷 Jikkoku, Onjuku-machi, Isumi-gun, Chiba 299-5114, Japan |
| 299-5103 | Shimmachi 新町 Shimmachi, Onjuku-machi, Isumi-gun, Chiba 299-5103, Japan |
| 299-5106 | Suka 須賀 Suka, Onjuku-machi, Isumi-gun, Chiba 299-5106, Japan |
| 299-5101 | Takayamada 高山田 Takayamada, Onjuku-machi, Isumi-gun, Chiba 299-5101, Japan |
| 299-5113 | Nanamoto 七本 Nanamoto, Onjuku-machi, Isumi-gun, Chiba 299-5113, Japan |
| 299-5107 | Hama 浜 Hama, Onjuku-machi, Isumi-gun, Chiba 299-5107, Japan |
| 299-5104 | Rokkemmachi 六軒町 Rokkemmachi, Onjuku-machi, Isumi-gun, Chiba 299-5104, 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.