| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Urata (君津市) | 292-0432 |
| Postal/ZIP Codes in Yaehara (君津市) | 299-1171 |
| Postal/ZIP Codes in Yamamoto (君津市) | 292-0401 |
| Postal/ZIP Codes in Yamatakahara (君津市) | 299-1125 |
| Postal/ZIP Codes in Yamatakino (君津市) | 292-0501 |
| Postal/ZIP Codes in Yanashiro (君津市) | 292-0515 |
| Postal/ZIP Codes in Yawata (君津市) | 299-1134 |
| Postal/ZIP Codes in Yokodai (君津市) | 299-1166 |
| Postal/ZIP Codes in Yoshino (君津市) | 292-0413 |