| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Arai, Gunma (新井) | 370-3503 |
| Postal/ZIP Codes in Hirobaba, Gunma (広馬場) | 370-3504 |
| Postal/ZIP Codes in Nagaoka, Gunma (長岡) | 370-3501 |
| Postal/ZIP Codes in Others, Gunma (その他) | 370-3500 |
| Postal/ZIP Codes in Uenohara, Gunma (上野原) | 370-3505 |
| Postal/ZIP Codes in Yamakoda, Gunma (山子田) | 370-3502 |
| Postal Codes in Kitagumma | |
|---|---|
| Postal/ZIP Codes in Yoshioka (吉岡町) | |
| Postal/ZIP Codes in Shinto (榛東村) | |