| Locality | Postal Code |
|---|---|
| Aoyagi (草加市) | 340-0002 |
| Aoyagicho (草加市) | 340-0007 |
| Asahicho (草加市) | 340-0053 |
| Asumacho (草加市) | 340-0032 |
| Benten (草加市) | 340-0004 |
| Choei (草加市) | 340-0051 |
| Chuo (草加市) | 340-0016 |
| Gakuencho (草加市) | 340-0042 |
| Hanaguri (草加市) | 340-0044 |
| Haracho (草加市) | 340-0048 |
| Hikawacho (草加市) | 340-0034 |
| Inari (草加市) | 340-0003 |
| Kakinokicho (草加市) | 340-0001 |
| Kimmeicho (草加市) | 340-0052 |
| Kitaya (草加市) | 340-0046 |
| Kitayacho (草加市) | 340-0047 |
| Koyama (草加市) | 340-0045 |
| Matsubara (草加市) | 340-0041 |
| Matsue (草加市) | 340-0013 |
| Naezukacho (草加市) | 340-0036 |
| Nakane (草加市) | 340-0005 |
| Nishicho (草加市) | 340-0035 |
| Nissatocho (草加市) | 340-0031 |
| Others (草加市) | 340-0000 |
| Ryoshinden Higashicho (草加市) | 340-0026 |
| Ryoshinden Nishicho (草加市) | 340-0027 |