There are 7 central bureaus in the first-level postal code:

Beijing, Shanghai, Wuhan, Guangzhou, Shenyang, Chengdu, and Xi’an;

The central bureaus in the second-level postal code 70:

Tianjin, Shijiazhuang, Zhengzhou, Xinyang, Luoyang, Yichang, Xiangyang, Changsha, Hengyang, Huaihua, Shenzhen, Shantou, Zhanjiang, Shaoguan, Nanning, Liuzhou, Guilin, Guiyang, Kunming, Haikou, Taiyuan, Houma, Datong, Hohhot, Hulunbuir, Jinzhou, Dalian, Changchun, Baicheng, Jilin, Harbin, Qiqihar, Jiamusi, Mudanjiang, Neijiang, Xichang, Nanchong, Chongqing, Lhasa, Baoji, Ankang, Lanzhou, Jiuquan, Xining, Golmud , Urumqi, Korla, Jinan, Yantai, Qingdao, Dezhou, Jining, Nanjing, Xuzhou, Changzhou, Hangzhou, Ningbo, Jinhua, Wenzhou, Hefei, Bengbu, Wuhu, Fuzhou, Xiamen, Nanping, Yingtan, Nanchang, Ganzhou, Yichun, Yinchuan ;

There are 124 central offices in the third-level postal areas:

Baoding, Xingtai, Handan, Hengshui, Cangzhou, Tangshan, Qinhuangdao, Zhangjiakou, Luohe, Nanyang, Shangqiu, Anyang, Xinxiang, Zhumadian, Huangshi, Enshi, Jingzhou, Shiyan, Xianning, Yueyang, Yongzhou, Loudi, Chenzhou, Jishou, Zhuzhou, Changde, Shaoyang, Dongguan, Zhuhai, Zhaoqing, Meizhou, Huizhou, Jiangmen, Yulin, Wuzhou, Baise, Hechi, Liupanshui, Kaili, Anshun, Yuping, Qujing, Chuxiong, Gejiu, Wenshan, Pu'er, Dali, Lincang, Baoshan, Changzhi, Yangquan, Shuozhou, Baotou, Bayannur, Ulanqab, Chifeng, Tongliao, Dandong, Yingkou, Anshan, Chaoyang, Fuxin, Tonghua, Yanji, Siping, Jiagedaqi, Guangyuan, Yibin, Leshan, Panzhihua, Dazhou, Mianyang, Ya'an, Luzhou, Wanzhou, Qamdu, Shigatse, Hanzhong, Yulin, Yan'an, Shangluo, Zhangye, Wuwei , Pingliang, Tianshui, Karamay, Yining, Beitun, Aksu, Kashgar, Hami, Linyi, Heze, Weifang, Liaocheng, Zibo, Wuxi, Lianyungang, Nantong, Suzhou, Huai'an, Yancheng, Yangzhou, Quzhou, Taizhou, Jiaxing, Huzhou , Lishui, Anqing, Fuyang, Huangshan, Suzhou, Quanzhou, Sanming, Longyan, Jingdezhen, Shangrao, Jiujiang, Ji'an, Fuzhou, Guyuan.