| Place | Post Code |
|---|---|
| Aiseng, Sompan | 03000 |
| Chakhamleu, Sompan | 03000 |
| Chavat, Sompan | 03000 |
| Donchai, Sompan | 03000 |
| Mekhong Neua, Sompan | 03000 |
| Mekhong Tai, Sompan | 03000 |
| Phagnalouangkhamping Tai, Sompan | 03000 |
| Phakham, Sompan | 03000 |
| Phangoua, Sompan | 03000 |
| Samsop, Sompan | 03000 |
| Sompan Kao, Sompan | 03000 |
| All postal codes in Long | |
|---|---|
| Chaleunxai, Long | |
| Chamai, Long | |
| Chomchaeng, Long | |
| Chongka, Long | |
| Sa, Long | |
| Sivilai, Long | |
| Sompan, Long | |
| That, Long | |
| Xiengkok, Long | |