| Locality | Postal Code |
|---|---|
| Akimaminorigaoka (安中市) | 379-0109 |
| Annaka (安中市) | 379-0116 |
| Furuya (安中市) | 379-0131 |
| Gobara (安中市) | 379-0135 |
| Haraichi (安中市) | 379-0133 |
| Higashikamiakima (安中市) | 379-0102 |
| Higashikamiisobe (安中市) | 379-0128 |
| Isobe (安中市) | 379-0127 |
| Itahana (安中市) | 379-0111 |
| Iwai (安中市) | 379-0112 |
| Kamigokan (安中市) | 379-0108 |
| Kamimanita (安中市) | 379-0123 |
| Kobetsuto (安中市) | 379-0132 |
| Matsuidamachi Arai (安中市) | 379-0216 |
| Matsuidamachi Goryo (安中市) | 379-0302 |
| Matsuidamachi Hara (安中市) | 379-0306 |
| Matsuidamachi Hijishio (安中市) | 379-0217 |
| Matsuidamachi Hitomi (安中市) | 379-0224 |
| Matsuidamachi Iriyama (安中市) | 379-0305 |
| Matsuidamachi Kamimasuda (安中市) | 379-0211 |
| Matsuidamachi Kitanomaki (安中市) | 379-0304 |
| Matsuidamachi Kokuga (安中市) | 379-0214 |
| Matsuidamachi Matsuida (安中市) | 379-0222 |
| Matsuidamachi Niibori (安中市) | 379-0221 |
| Matsuidamachi Nikenzaike (安中市) | 379-0223 |
| Matsuidamachi Nishinomaki (安中市) | 379-0303 |