| Locality | Postal Code |
|---|---|
| Tangjeong-myeon, Asan (탕정면) | 31449, 31452, 31453, 31454, 31455, … |
| Yeomchi-eup, Asan (염치읍) | 31440, 31441, 31442, 31444, 31445, … |
| Yeongin-myeon, Asan (영인면) | 31401, 31402, 31420, 31421, 31422, … |
| Yonghwa-Dong, Asan (용화동) | 31566, 31567, 31568, 31569, 31571, … |