| Locality | Post Code |
|---|---|
| Baengnyeong-myeon, Ongjin (백령면) | 23100, 23101, 23102, 23103, 23104 |
| Bukdo-myeon, Ongjin (북도면) | 23110, 23111, 23112, 23113, 23114, … |
| Daecheong-myeon, Ongjin (대청면) | 23105, 23106 |
| Deokjeok-myeon, Ongjin (덕적면) | 23129, 23130, 23131, 23132, 23133, … |
| Jawol-myeon, Ongjin (자월면) | 23124, 23125, 23126, 23127, 23128 |
| Yeongheung-myeon, Ongjin (영흥면) | 23117, 23118, 23119, 23120, 23121, … |
| Yeonpyeong-myeon, Ongjin (연평면) | 23107, 23108, 23109 |
| Incheon Postal Codes | |
|---|---|
| Yeonsu (연수구) | Seo (서구) |
| Ongjin (옹진군) | Namdong (남동구) |
| Nam (남구) | Jung (중구) |
| Gyeyang (계양구) | Ganghwa (강화군) |
| Dong (동구) | Bupyeong (부평구) |