| Locality | Post Code |
|---|---|
| Oi (大垣市) | 503-0836 |
| Oikecho (大垣市) | 503-0863 |
| Okachimachi (大垣市) | 503-0898 |
| Omura (大垣市) | 503-0814 |
| Oshimacho (大垣市) | 503-0001 |
| Others (大垣市) | 503-0000 |
| Otoba (大垣市) | 503-0956 |
| Ryokecho (大垣市) | 503-0014 |
| Sakashitacho (大垣市) | 503-0009 |
| Sambongi (大垣市) | 503-0813 |
| Sanaecho (大垣市) | 503-0821 |
| Shimacho (大垣市) | 503-0996 |
| Shimazato (大垣市) | 503-0935 |
| Shimbabacho (大垣市) | 503-0921 |
| Shimizucho (大垣市) | 503-0883 |
| Shimmachi (大垣市) | 503-0872 |
| Shimmei (大垣市) | 503-2205 |
| Shinchicho (大垣市) | 503-0894 |
| Shindencho (大垣市) | 503-0856 |
| Shinkaicho (大垣市) | 503-0004 |
| Shinnagamatsu (大垣市) | 503-0992 |
| Shinnagasawacho (大垣市) | 503-0831 |
| Shizusatocho (大垣市) | 503-0983 |
| Showa (大垣市) | 503-0942 |
| Shukujicho (大垣市) | 503-0024 |
| Sobutsu (大垣市) | 503-0934 |