Too many. At least 10,000 airports around the world have IATA airport codes, including the following domestic ones.
Domestic Airport Code
AAT(ZWAT) Altay Altay Airport AKA(ZLAK) Ankang Wulipu Airport AKU(ZWAK) Aksu Wensu Airport AQG(ZSAQ) Anqing City Dalongshan Airport AYN (ZNNN) Anyang Anyang Airport BAV (ZBOW) Baotou Hailanpao Airport BHY (ZGBH) Beihai Fucheng Airport BPX (ZUBD) Qamdo Changdu Macao Airport BSD (ZPBS) Baoshan Baoshan Airport CAN (ZGGG ) Guangzhou Baiyun International Airport CGD (ZGCD) Changde Taohua Airport CGO (ZHCC) Zhengzhou Xinzheng International Airport CGQ (ZYCC) Changchun Dafangshen Airport CHG (ZYCY) Chaoyang Chaoyang Airport CHW (ZNNN) Jiuquan Jiuquan Airport CIF (ZBCF) Chifeng Tuchengzi Airport CIH (ZBCZ) Changzhi Wangcun Airport CKG (ZUCK) Chongqing Jiangbei Airport CNI (ZNNN) Changhai Dachangshan Island Airport CSX (ZGHA) Changsha Huanghua International Airport CTU (ZUUU) Chengdu Shuangliu International Airport CZX (ZSCG) Changzhou Benniu Airport DAT (ZBDT) Datong Huairen Airport DAX (ZUDX) Dazhouhe Shiba Airport DDG (ZYDD) Dandong Langtou Airport DGM Dongguan City has no airport (note) DIG (ZPDQ) ) Shangri-La Diqing Airport DLC (ZYTL) Dalian Zhoushuizi Airport DLU (ZPDL) Dali Dali Airport DNH (ZLDH) Dunhuang Dunhuang Airport DOY (ZNNN) Dongying Dongying Airport DYG (ZGDY) Zhangjiajie Hehua Airport ENH (ZHES) Enshi Xujiaping Airport ENY (ZLYA) Yan'an Ershilipu Airport FIG (ZSFY) Fuyang Xiguan Airport FOC (ZSFZ) Fuzhou Changle International Airport FYN (ZWFY) Fuyun Keketuohai Airport GHN (ZUGH) Guanghan City Guanghan Airport GOQ (ZLGM) Golmud Airport HAK (ZJHK) Haikou Meilan International Airport HEK (ZYHE) Heihe Heihe Airport HET (ZBHH) Hohhot Baita Airport HFE (ZSOF) Hefei Luogang Airport HGH (ZSHC) Hangzhou Xiaoshan International Airport HLD (ZBLA) Hailar Dongshan Airport HLH (ZBUL) Ulanhot Ulanhot Airport HMI (ZWHM) Hami Hami Airport HNY (ZGHY) Hengyang Hengyang Airport HRB (ZYHB) Harbin Yanjiagang International Airport HSN (ZSZS) Zhoushan Putuoshan Airport HTN (ZWTN) Hotan Hotan Airport HYN (ZSLQ) Huangyan Luqiao Airport HZG (ZLHZ) Hanzhong Xiguan Airport INC (ZLIC) Yinchuan Hedong Airport IQM (ZWCM) Qiemo Qiemo Airport IQN (ZLQY) Qingyang City Xifeng Town Airport JDZ (ZSJD) Jingdezhen City Luojia Airport JGN (ZLJQ) Jiayuguan City Jiayuguan Airport JGS (ZNNN) Jinggangshan City Jinggangshan Airport JHG (ZPJH) Xishuangbanna City Jinghong Airport JIL (ZYJL) Jilin City Ertaizi Airport JIU (ZSJJ) Jiujiang Lushan Airport JJN (ZSQZ) Quanzhou Jinjiang Airport JMU (ZYJM) Jiamusi Dongjiao Airport JNZ (ZYJZ) Jinzhou Xiaolingzi Airport JUZ (ZSJU) Quzhou Quzhou Airport JZH (ZNNN) Jiuzhaigou Huanglong Airport KCA (ZWKC) Kuqa City Kuqa Airport KHG (ZWSH) Kashgar City Kashgar Airport KHN (ZSCN) Nanchang City Changbei Airport KMG (ZPPP) Kunming City Wujiaba International Airport KOW (ZSGZ) Ganzhou City Golden Airport KRL (ZWKL) Korla City Korla Airport KRY (ZWKM) Karamay Karamay Airport KWE (ZUGY) Guiyang Longdongbao Airport KWL (ZGKL) Guilin Liangjiang International Airport LCX (ZNNN) Liancheng Liancheng Airport LHW (ZLLL) Lanzhou Zhongchuan Airport
LJG(ZPLJ) Lijiang Lijiang Airport LNJ(ZPLC) Lincang Lincang Airport LUM(ZPMS) Luxi Mangshi Airport LXA(ZULS) Lhasa Gonggar Airport LYA(ZHLY) Luoyang Beijiao Airport LYG(ZSLG) ) Lianyungang Baitabu Airport LYI (ZSLY) Linyi Linyi Airport LZH (ZGZH) Liuzhou Bailian Airport LZO (ZULZ) Luzhou Xuantian Airport MDG (ZYMD) Mudanjiang Hailang Airport MIG (ZUMY) Mianyang Nanjiao Airport MXZ (ZGMX) ) Meixian City Meixian Airport NAO (ZUNC) Nanchong Duweiba Airport NAY (ZBNY) Beijing Nanyuan Airport NDG (ZYQQ) Qiqihar Sanjiazi Airport NGB (ZSNB) Ningbo Lishe Airport NKG (ZSNJ) Nanjing Lukou International Airport NNG (ZGNN) Nanning Wuxu Airport NNY (ZHNY) Nanyang Jiangying Airport NTG (ZSNT) Nantong Xingdong Airport PEK (ZBAA) Beijing Capital Airport PVG (ZSPD) Shanghai Pudong Airport PZI (ZNNN) Panzhihua Panzhihua Airport SHA (ZSSS) Shanghai Hongqiao Airport SHE (ZYTX) Shenyang Taoxian Airport SHP (ZBSH) Shanhaiguan Qinhuangdao Airport SHS (ZHSS) Jingzhou Shashi Airport SJW (ZBSJ) Shijiazhuang Zhengding Airport SWA (ZGOW) Outside Shantou City Sarawak Airport SYM (ZPSM) Simao Simao Airport SYX (ZGSY) Sanya Phoenix International Airport SZX (ZGSZ) Shenzhen Baoan International Airport TAO (ZSQD) Qingdao Liuting International Airport TCG (ZWTC) Tacheng Tacheng Airport TEN (ZUTR ) Tongren Daxing Airport TGO (ZBTL) Tongliao Tongliao Airport TNA (ZSJN) Jinan Yaoqiang International Airport TNH (ZYTN) Tonghua Tonghua Airport TSN (ZBTJ) Tianjin Binhai International Airport TXN (ZSTX) Huangshan Tunxi Airport TYN ( ZBYN) Taiyuan Wusu Airport URC (ZWWW) Urumqi Diwopu Airport UYN (ZLYL) Yulin Xisha Airport WEF (ZSWF) Weifang Ershilipu Airport WEH (ZSWH) Weihai Dashuibo Airport WNZ (ZSWZ) Wenzhou Yongqiang Airport WUA(ZNNN) Wuhai Wuhai Airport WUH(ZHHH) Wuhan Tianhe International Airport WUS(ZSWY) Wuyishan Wuyishan Airport WUX(ZSWX) Wuxi Wuxi Airport WUZ(ZGWZ) Wuzhou Changzhou Island Airport WXN (ZULP) Wanxian City Wanxian Airport XFN (ZHXF) Xiangfan City Liuji Airport XIC (ZUXC) Xichang City Qingshan Airport XIL (ZBXH) Xilinhot City Xilinhot XIY (ZLXY) Xi'an Xianyang International Airport XMN (ZSAM) Xiamen City Gaoqi International Airports Airport YIW(ZSYW) Yiwu Yiwu Airport YNJ(ZYYJ) Yanji Chaoyangchuan Airport YNT(ZSYT) Yantai Laishan Airport ZAT(ZPZT) Zhaotong Zhaotong Airport ZHA(ZGZJ) Zhanjiang Zhanjiang Airport ZUH(ZGSD) Zhuhai Sanzao Airport ZYI (ZUZY) Zunyi City Zunyi Airport Note: In April 2011, according to the official approval of the Civil Aviation Administration of China and IATA, Dongguan determined that the three-character aviation code is DGM, becoming the first city in the country without an airport, but with an airport code