| Place | Postal Code |
|---|---|
| 粟生 (Ao, Chiba) | 283-0105 |
| 荒生 (Araoi, Chiba) | 283-0107 |
| 不動堂 (Fudodo, Chiba) | 283-0113 |
| 藤下 (Fujishita, Chiba) | 283-0112 |
| 細屋敷 (Hosoyashiki, Chiba) | 283-0111 |
| 片貝 (Katakai, Chiba) | 283-0104 |
| 小関 (Koseki, Chiba) | 283-0102 |
| 真亀 (Magame, Chiba) | 283-0114 |
| 真亀新田 (Magameshinden, Chiba) | 283-0115 |
| 西野 (Nishino, Chiba) | 283-0116 |
| その他 (Others, Chiba) | 283-0100 |
| 作田 (Sakuda, Chiba) | 283-0101 |
| 下貝塚 (Shimokaizuka, Chiba) | 283-0117 |
| 宿 (Shuku, Chiba) | 283-0106 |
| 田中荒生 (Tanakaaraoi, Chiba) | 283-0103 |
| Postal Codes in Sambu | |
|---|---|
| Kujukuri (九十九里町) | |
| Shibayama (芝山町) | |
| Yokoshibahikari (横芝光町) | |