About postal code 31991
The postal code 31991 routes mail to 서산시 in the 충청남도 region of South Korea. Use it as the postal segment of any address in this area, and confirm unusual addresses with the local postal operator.
South Korea · Postal code
31991 - 서산시
Postal code 31991 is 서산시 in 충청남도, South Korea.
| Postal code | 31991 |
| Place | 서산시 |
| Region | 충청남도 |
| District | 서산시 |
| Country | South Korea (KR) |
| Coordinates | 36.7763, 126.4569 (map) |