| Locality | Postal Code |
|---|---|
| Ariakecho (三笠市) | 068-2151 |
| Higashikiyozumicho (三笠市) | 068-2104 |
| Honcho (三笠市) | 068-2141 |
| Hongocho (三笠市) | 068-2161 |
| Horonaicho (三笠市) | 068-2145 |
| Horonai Hatsunecho (三笠市) | 068-2148 |
| Horonai Hokuseicho (三笠市) | 068-2143 |
| Horonai Kanayacho (三笠市) | 068-2144 |
| Horonai Kasugacho (三笠市) | 068-2146 |
| Horonai Shineicho (三笠市) | 068-2147 |
| Horonai Sumiyoshicho (三笠市) | 068-2142 |
| Ichikishiri (三笠市) | 068-2164 |
| Ikushumbetsucho (三笠市) | 068-2116 |
| Ikushumbetsu Kawamukaicho (三笠市) | 068-2112 |
| Ikushumbetsu Kuriokacho (三笠市) | 068-2114 |
| Ikushumbetsu Nakajimacho (三笠市) | 068-2117 |
| Ikushumbetsu Nishikicho (三笠市) | 068-2111 |
| Ikushumbetsu Senjucho (三笠市) | 068-2118 |
| Ikushumbetsu Takimicho (三笠市) | 068-2115 |
| Ikushumbetsu Yamatecho (三笠市) | 068-2113 |
| Kashiwacho (三笠市) | 068-2108 |
| Katsurazawa (三笠市) | 068-2101 |
| Kawanai (三笠市) | 068-2162 |
| Kayano (三笠市) | 068-2166 |
| Kiyozumicho (三笠市) | 068-2105 |
| Misonocho (三笠市) | 068-2106 |