As of the 2010 census, does Dongguan or Tongzhou District, Beijing have a larger population?
Dongguan:  Often considered the cultural capital of the Pearl River Delta, Dongguan borders the provincial capital of Guangzhou to the north, Huizhou to the northeast, Shenzhen to the south, and the Pearl River to the west. Dongguan:  Dongguan ranks behind only Shenzhen, Shanghai and Suzhou in exports among Chinese cities, with $65.54 billion in shipments.
i don't know