Datong is a prefecture-level city in northern Shanxi Province in the People's Republic of China. It lies in the Datong Basin at an elevation of 1,040 metres (3,410 ft), and borders Inner Mongolia to the north and west and Hebei to the east.
As of the 2020 census, Datong had a population of 3,105,591, of whom 1,790,452 lived in the built-up area formed by two of its four urban districts, Pingcheng and Yungang. The remaining two urban districts, Yunzhou and Xinrong, are not yet conurbated with that built-up area.