| Postal/ZIP Codes in Eunha-myeon, Hongseong (은하면) |
32209, 32210 |
| Postal/ZIP Codes in Galsan-myeon, Hongseong (갈산면) |
32200, 32201, 32202, 32203, 32213, … |
| Postal/ZIP Codes in Geumma-myeon, Hongseong (금마면) |
32217, 32280, 32281, 32282 |
| Postal/ZIP Codes in Guhang-myeon, Hongseong (구항면) |
32201, 32213, 32214, 32215, 32288 |
| Postal/ZIP Codes in Gwangcheon-eup, Hongseong (광천읍) |
32210, 32285, 32286, 32287, 32288, … |
| Postal/ZIP Codes in Gyeolseong-myeon, Hongseong (결성면) |
32200, 32203, 32204, 32208, 32209, … |
| Postal/ZIP Codes in Hongbuk-Eup, Hongseong (홍북읍) |
32251, 32252, 32254, 32255, 32256, … |
| Postal/ZIP Codes in Hongdong-myeon, Hongseong (홍동면) |
32243, 32283, 32284 |
| Postal/ZIP Codes in Hongseong-eup, Hongseong (홍성읍) |
32216, 32217, 32218, 32219, 32220, … |
| Postal/ZIP Codes in Janggok-myeon, Hongseong (장곡면) |
32285, 32287, 32298, 32299 |
| Postal/ZIP Codes in Seobu-myeon, Hongseong (서부면) |
32204, 32205, 32206, 32207, 32208 |