| Locality | Postal Code |
|---|---|
| Mukaino (北斗市) | 041-1231 |
| Murauchi (北斗市) | 041-1226 |
| Murayama (北斗市) | 041-1244 |
| Nakano (北斗市) | 049-0155 |
| Nakanodori (北斗市) | 049-0156 |
| Nakayama (北斗市) | 041-1243 |
| Nanaehama (北斗市) | 049-0111 |
| Nozaki (北斗市) | 049-0158 |
| Oiwake (北斗市) | 049-0101 |
| Oshiage (北斗市) | 049-0152 |
| Others (北斗市) | 049-0100 |
| Sakuratai (北斗市) | 049-0151 |
| Shimizukawa (北斗市) | 041-1221 |
| Shirakawa (北斗市) | 041-1211 |
| Showa (北斗市) | 049-0142 |
| Soeyama (北斗市) | 049-0154 |
| Taniyoshi (北斗市) | 049-0141 |
| Tobetsu (北斗市) | 049-0282 |
| Tokiwa (北斗市) | 049-0171 |
| Tomigawa (北斗市) | 049-0131 |
| Yafurai (北斗市) | 049-0286 |
| Yanagisawa (北斗市) | 049-0133 |
| Yunosawa (北斗市) | 049-0284 |