| Postal Code | 1123 |
| Postal Code Name | Copenhagen K |
| Region | Capital Region of Denmark |
| Municipality | Copenhagen Municipality |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 1050 1101 1104 1107 1110 1111 1116 1119 1120 1121 1122 1124 1130 1264 1300 1304 1306 1307 1350 1353 1356 1357 1358 1360 1361 1362 1364 1366 1371 2200 |