| Locality | Postal Code |
|---|---|
| Ainomachi (鴻巣市) | 365-0068 |
| Akagi (鴻巣市) | 365-0002 |
| Akagidai (鴻巣市) | 365-0001 |
| Akamidai (鴻巣市) | 365-0064 |
| Anyoji (鴻巣市) | 365-0021 |
| Arai (鴻巣市) | 365-0011 |
| Barahara (鴻巣市) | 369-0124 |
| Chuo (鴻巣市) | 365-0032 |
| Enokido (鴻巣市) | 369-0123 |
| Fujimicho (鴻巣市) | 365-0046 |
| Fukiage (鴻巣市) | 369-0136 |
| Fukiagefujimi (鴻巣市) | 369-0121 |
| Fukiagehoncho (鴻巣市) | 369-0115 |
| Fukuro (鴻巣市) | 369-0131 |
| Goji (鴻巣市) | 365-0022 |
| Hachimanden (鴻巣市) | 365-0073 |
| Haramamuro (鴻巣市) | 365-0043 |
| Hibarino (鴻巣市) | 365-0031 |
| Higashi (鴻巣市) | 365-0039 |
| Hikawacho (鴻巣市) | 365-0045 |
| Hiroda (鴻巣市) | 365-0005 |
| Hommiyacho (鴻巣市) | 365-0076 |
| Honcho (鴻巣市) | 365-0038 |
| Ichinonawa (鴻巣市) | 365-0072 |
| Inaricho (鴻巣市) | 365-0063 |
| Joko (鴻巣市) | 365-0024 |