| Postal Code | Area | |
|---|---|---|
| 310-0001 | Kamigachicho (上河内町) | View |
| 310-0002 | Nakagachicho (中河内町) | View |
| 310-0003 | Yanakawacho (柳河町) | View |
| 310-0004 | Aoyagicho (青柳町) | View |
| 310-0005 | Suifucho (水府町) | View |
| 310-0011 | Sannomaru (三の丸) | View |
| 310-0012 | Joto (城東) | View |
| 310-0013 | Wakamiya (若宮) | View |
| 310-0014 | Wakamiyacho (若宮町) | View |
| 310-0015 | Miyamachi (宮町) | View |
| 310-0021 | Minamimachi (南町) | View |
| 310-0022 | Baiko (梅香) | View |
| 310-0023 | Shimobaiko (下梅香) | View |
| 310-0024 | Bizenmachi (備前町) | View |
| 310-0025 | Tennocho (天王町) | View |
| 310-0026 | Izumicho (泉町) | View |
| 310-0031 | Daikumachi (大工町) | View |
| 310-0032 | Motoyamacho (元山町) | View |
| 310-0033 | Tokiwacho (常磐町) | View |
| 310-0034 | Midoricho (緑町) | View |