| City/County | Telephone Area Coce | Postcode |
| Lanzhou | 0931 | 730000 |
| Linxia | 0930 | 731100 |
| Dingxi | 0932 | 743000 |
| Pingliang | 0933 | 744000 |
| Qingyang | 0934 | 745100 |
| Wuwei | 0935 | 733000 |
| Zhangye | 0936 | 734000 |
| Jiuquan | 0937 | 735000 |
| Tianshui | 0938 | 741000 |
| Wudou | 0939 | |
| Hezuo | 09411 | |
| Xiahe | 09412 | 747100 |
| Baiyin | 09430 | 730900 |
| Jinchang | 09455 | 737100 |
| Yongdeng | 09460 | 730300 |
| Jiayuguan | 09477 | 735100 |