| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Baengnyeong-myeon, Ongjin (백령면) | 23100, 23101, 23102, 23103, 23104 |
| Postal/ZIP Codes in Bukdo-myeon, Ongjin (북도면) | 23110, 23111, 23112, 23113, 23114, … |
| Postal/ZIP Codes in Daecheong-myeon, Ongjin (대청면) | 23105, 23106 |
| Postal/ZIP Codes in Deokjeok-myeon, Ongjin (덕적면) | 23129, 23130, 23131, 23132, 23133, … |
| Postal/ZIP Codes in Jawol-myeon, Ongjin (자월면) | 23124, 23125, 23126, 23127, 23128 |
| Postal/ZIP Codes in Yeongheung-myeon, Ongjin (영흥면) | 23117, 23118, 23119, 23120, 23121, … |
| Postal/ZIP Codes in Yeonpyeong-myeon, Ongjin (연평면) | 23107, 23108, 23109 |