Dongguan Guangcheng Guangdong Province. Dongguan, also known as Guancheng, is located in Guangdong Province, with an administrative division code of 441900. In 1998, the State Council approved the upgrade of Dongguan City to a prefecture-level city, directly under the jurisdiction of Guangdong Province. Dongguan is a famous hometown of overseas Chinese, with about 1.2 million compatriots from Hong Kong and Macao and about 300,000 overseas Chinese.