| Postal Code | Area | |
|---|---|---|
| 055-0101 | Nibutani (二風谷) | View |
| 055-0102 | Kobira (小平) | View |
| 055-0103 | Kawamukai (川向) | View |
| 055-0104 | Shiunkotsu (紫雲古津) | View |
| 055-0105 | Saruba (去場) | View |
| 055-0106 | Nina (荷菜) | View |
| 055-0107 | Honcho (本町) | View |
| 055-0321 | Nukibetsu (貫気別) | View |
| 055-0322 | Asahi (旭) | View |
| 055-0323 | Memu (芽生) | View |
| 055-0324 | Nioi (荷負) | View |
| 055-0325 | Osachinai (長知内) | View |
| 055-0411 | Furenaicho (振内町) | View |
| 055-0412 | Horokeshi (幌毛志) | View |
| 055-0413 | Niseu (仁世宇) | View |
| 055-0414 | Iwachishi (岩知志) | View |
| 055-0415 | Toyonuka (豊糠) | View |