| Postal/ZIP Codes in Buljeong-myeon, Goesan (불정면) |
28000, 28001, 28002, 28003, 28004, … |
| Postal/ZIP Codes in Cheongan-myeon, Goesan (청안면) |
28048, 28049, 28050, 28051, 28052, … |
| Postal/ZIP Codes in Cheongcheon-myeon, Goesan (청천면) |
28048, 28053, 28054, 28058, 28059, … |
| Postal/ZIP Codes in Chilseong-myeon, Goesan (칠성면) |
28016, 28017, 28018, 28019, 28020, … |
| Postal/ZIP Codes in Gammul-myeon, Goesan (감물면) |
28004, 28005, 28006, 28007 |
| Postal/ZIP Codes in Goesan-eup, Goesan (괴산읍) |
28022, 28023, 28024, 28025, 28026, … |
| Postal/ZIP Codes in Jangyeon-myeon, Goesan (장연면) |
28008, 28009, 28010 |
| Postal/ZIP Codes in Mungwang-myeon, Goesan (문광면) |
28048, 28055, 28056, 28057, 28058 |
| Postal/ZIP Codes in Sari-myeon, Goesan (사리면) |
28045, 28046, 28047 |
| Postal/ZIP Codes in Sosu-myeon, Goesan (소수면) |
28040, 28041, 28042, 28043, 28044, … |
| Postal/ZIP Codes in Yeonpung-myeon, Goesan (연풍면) |
28011, 28012, 28013, 28014, 28015 |