| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Tonocho (水戸市) | 310-0846 |
| Postal/ZIP Codes in Tsuijicho (水戸市) | 319-0313 |
| Postal/ZIP Codes in Uchihara (水戸市) | 319-0317 |
| Postal/ZIP Codes in Uchiharacho (水戸市) | 319-0315 |
| Postal/ZIP Codes in Ushibushicho (水戸市) | 319-0311 |
| Postal/ZIP Codes in Wakamiya (水戸市) | 310-0013 |
| Postal/ZIP Codes in Wakamiyacho (水戸市) | 310-0014 |
| Postal/ZIP Codes in Wataricho (水戸市) | 310-0902 |
| Postal/ZIP Codes in Yadacho (水戸市) | 310-0825 |
| Postal/ZIP Codes in Yanagimachi (水戸市) | 310-0817 |
| Postal/ZIP Codes in Yanakawacho (水戸市) | 310-0003 |
| Postal/ZIP Codes in Yatsucho (水戸市) | 311-4164 |
| Postal/ZIP Codes in Yonezawacho (水戸市) | 310-0847 |
| Postal/ZIP Codes in Yoshida (水戸市) | 310-0832 |
| Postal/ZIP Codes in Yoshinumacho (水戸市) | 310-0827 |
| Postal/ZIP Codes in Yoshizawacho (水戸市) | 310-0845 |
| Postal/ZIP Codes in Yurigaokacho (水戸市) | 311-1134 |