| Postal/ZIP Codes in Areum-Dong, Sejong (아름동) |
30099, 30100 |
| Postal/ZIP Codes in Bangok-Dong, Sejong (반곡동) |
30145, 30146, 30147, 30148, 30149 |
| Postal/ZIP Codes in Boram-Dong, Sejong (보람동) |
30150, 30151, 30152 |
| Postal/ZIP Codes in Bugang-myeon, Sejong (부강면) |
30067, 30071, 30072, 30073, 30074, … |
| Postal/ZIP Codes in Daepyeong-Dong, Sejong (대평동) |
30083, 30152, 30153, 30154 |
| Postal/ZIP Codes in Dajeong-Dong, Sejong (다정동) |
30123, 30124, 30125 |
| Postal/ZIP Codes in Dodam-Dong, Sejong (도담동) |
30097, 30098, 30099, 30100 |
| Postal/ZIP Codes in Eojin-Dong, Sejong (어진동) |
30064, 30096, 30102, 30103, 30104, … |
| Postal/ZIP Codes in Garam-Dong, Sejong (가람동) |
30065 |
| Postal/ZIP Codes in Geumnam-myeon, Sejong (금남면) |
30079, 30080, 30081, 30082, 30083, … |
| Postal/ZIP Codes in Goun-Dong, Sejong (고운동) |
30062, 30063, 30101 |
| Postal/ZIP Codes in Haemil-Dong, Sejong (해밀동) |
30092, 30095 |
| Postal/ZIP Codes in Hansol-Dong, Sejong (한솔동) |
30130 |
| Postal/ZIP Codes in Hapgang-Dong, Sejong (합강동) |
30136, 30136, 30134 |
| Postal/ZIP Codes in Janggun-myeon, Sejong (장군면) |
30050, 30051, 30052, 30053, 30054, … |
| Postal/ZIP Codes in Jeondong-myeon, Sejong (전동면) |
30004, 30009, 30010, 30011, 30012, … |
| Postal/ZIP Codes in Jeonui-myeon, Sejong (전의면) |
30003, 30004, 30005, 30006, 30007, … |
| Postal/ZIP Codes in Jiphyeon-Dong, Sejong (집현동) |
30140, 30141, 30142, 30143, 30144 |
| Postal/ZIP Codes in Jochiwon-eup, Sejong (조치원읍) |
30015, 30016, 30017, 30018, 30019, … |
| Postal/ZIP Codes in Jongchon-Dong, Sejong (종촌동) |
30064 |
| Postal/ZIP Codes in Naseong-Dong, Sejong (나성동) |
30123, 30127, 30128, 30129, 30130 |
| Postal/ZIP Codes in Saerom-Dong, Sejong (새롬동) |
30125, 30126, 30127 |
| Postal/ZIP Codes in Sanul-Dong, Sejong (산울동) |
30090 |
| Postal/ZIP Codes in Sodam-Dong, Sejong (소담동) |
30147, 30148, 30149, 30150, 30151 |
| Postal/ZIP Codes in Sojeong-myeon, Sejong (소정면) |
30000, 30001, 30002, 30005 |
| Postal/ZIP Codes in Yeondong-myeon, Sejong (연동면) |
30066, 30067, 30068, 30069, 30070, … |