| Locality | Postal Code |
|---|---|
| Kamatsuka (鴻巣市) | 369-0112 |
| Kami (鴻巣市) | 365-0078 |
| Kamiege (鴻巣市) | 365-0012 |
| Kamioinezuka (鴻巣市) | 365-0034 |
| Kamiya (鴻巣市) | 365-0027 |
| Kasahara (鴻巣市) | 365-0023 |
| Kawazura (鴻巣市) | 365-0061 |
| Kitanakano (鴻巣市) | 365-0058 |
| Kitane (鴻巣市) | 365-0003 |
| Kitashinshuku (鴻巣市) | 369-0116 |
| Komatsu (鴻巣市) | 365-0041 |
| Konosu (鴻巣市) | 365-0028 |
| Koya (鴻巣市) | 369-0133 |
| Kusu (鴻巣市) | 365-0014 |
| Maesuna (鴻巣市) | 369-0132 |
| Matsubara (鴻巣市) | 365-0042 |
| Mida (鴻巣市) | 365-0062 |
| Midoricho (鴻巣市) | 365-0053 |
| Minami (鴻巣市) | 369-0122 |
| Mitsugi (鴻巣市) | 365-0066 |
| Miyaji (鴻巣市) | 365-0075 |
| Miyamae (鴻巣市) | 365-0051 |
| Myoyo (鴻巣市) | 369-0135 |
| Nakai (鴻巣市) | 365-0065 |
| Ningyo (鴻巣市) | 365-0037 |
| Nishinakazone (鴻巣市) | 365-0026 |