| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Ya (大野市) | 912-0008 |
| Postal/ZIP Codes in Yamachi (大野市) | 912-0148 |
| Postal/ZIP Codes in Yamatocho (大野市) | 912-0082 |
| Postal/ZIP Codes in Yayoicho (大野市) | 912-0052 |
| Postal/ZIP Codes in Yokomakura (大野市) | 912-0012 |
| Postal/ZIP Codes in Yomeicho (大野市) | 912-0022 |
| Postal/ZIP Codes in Yoshi (大野市) | 912-0401 |
| Postal/ZIP Codes in Yoshinocho (大野市) | 912-0034 |