some sites also use the prefix 6. Weihai – 631 Zaozhuang – 632 Rizhao – 633 Liaocheng – 635 Laiwu was using 634, now merged to Jinan's 531, former numbers are re-prefixxed as 5317 when merging. Guangdong – 66x While most areas in Guangdong use the prefix 75x and 76x, some sites also use the prefix 6. The provincial capital Guangzhou uses code 20. Shanwei – 660 Yangjiang – 662 Jieyang – 663 Maoming – 668 Chaoyang county-level city was using 661, now changed to 754 after splitted to Chaoyang and Chaonan districts and join Shantou. Yunnan – 69x While most areas in Yunnan use the prefix 87x and 88x, a couple of areas also use the prefix 6. Xishuangbanna – 691 Dehong – 692 Area 7 – Central-Southern China Operating Center These are area codes for the central provinces of Hubei, Hunan, Guangdong (predominantly), Jiangxi, and the autonomous region of Guangxi. Hubei – 71x 72x 20 - except Huarong district which uses Wuhan's 27. Hunan – 73x 74x 21 - Formerly 733, abolished. 22 - Formerly 732, abolished. Guangdong – 75x 76x 23 - Shunde formerly 765, abolished. Guangxi – 77x 78x 24 - Split from Wuzhou Prefecture, original area code inherited. 25 - Split from Liuzhou Prefecture, original area code inherited. 26 - Split from Yulin Prefecture, original area code inherited. 27 - Split from Nanning Prefecture, original area code inherited. Jiangxi – 79x 70x Area 8 -Southwestern China Operating Center These are area codes for the provinces of Sichuan, Hainan, Guizhou, Yunnan (predominantly) and the autonomous region of Tibet. Sichuan – 81x 82x 83x Guizhou – 85x 86x 28 - Formerly 852, 853, abolished 2014. Yunnan – 87x 88x 29 - Dongchuan formerly 881, incorporated into 871 30 - also de-facto used by Wa State of Tibet/Xizang – 89(1–7) Hainan – 898 All telephone numbers are 8-digit in Hainan. Formerly (most likely before 2000), Sanya, Wuzhishan, Lingshui, Ledong, Baoting and Qiongzhong were 899, Danzhou, Dongfang, Lingao, Baisha and Changjiang were 890. Area 9 – Northwestern China Operating Center These are area codes for northwestern regions including the provinces of Shaanxi, Gansu and Qinghai, as well as the autonomous regions of Ningxia and Xinjiang. Shaanxi (陕西) – 91x 92x Gansu – 93x 94x 31 - Shared area code due to small size. Ningxia – 95x 96x Qinghai – 97x 98x 32 - Area under the administration of Golmud