| Locality | Post Code |
|---|---|
| Nakamurahama (胎内市) | 959-2708 |
| Namitsuki (胎内市) | 959-2621 |
| Natsui (胎内市) | 959-2822 |
| Niidano (胎内市) | 959-2623 |
| Nishihoncho (胎内市) | 959-2656 |
| Nishijo (胎内市) | 959-2658 |
| Nishijocho (胎内市) | 959-2651 |
| Nishikawauchi (胎内市) | 959-2667 |
| Nishisakaecho (胎内市) | 959-2646 |
| Nonaka (胎内市) | 959-2627 |
| Oide (胎内市) | 959-2604 |
| Oiwake (胎内市) | 959-2622 |
| Ojiya (胎内市) | 959-2612 |
| Okawacho (胎内市) | 959-2644 |
| Omishin (胎内市) | 959-2801 |
| Omotecho (胎内市) | 959-2631 |
| Onagatani (胎内市) | 959-2813 |
| Others (胎内市) | 959-2600 |
| Otsuka (胎内市) | 959-2665 |
| Sakai (胎内市) | 959-2825 |
| Sanno (胎内市) | 959-2706 |
| Sasaguchihama (胎内市) | 959-2701 |
| Sekizawa (胎内市) | 959-2633 |
| Shibahashi (胎内市) | 959-2664 |
| Shimoakadani (胎内市) | 959-2806 |
| Shimoarasawa (胎内市) | 959-2816 |