| City/County | Telephone Area Coce | Postcode |
| Jinan | 0531 | 250000 |
| Heze | 0530 | 274000 |
| Qingdao | 0532 | 266000 |
| Zibo | 0533 | 255000 |
| Dezhou | 0534 | 253000 |
| Yantai | 0535 | 264000 |
| Weifang | 0536 | 261000 |
| Jining | 0537 | 272100 |
| Taian | 0538 | 271000 |
| Linyi | 0539 | 276000 |
| Rizhao | 05400 | 276800 |
| Beizhen | 05431 | 256600 |
| Weihai | 05451 | 264200 |
| Zaozhuang | 05471 | 277100 |