Yes Hongkong is a Chinese City.
Hong Kong is a Special Administrative Region of the People's Republic of China, is an autonomous territory on the eastern side of the Pearl River estuary in East Asia, south of the mainland Chinese province of Guangdong, and east of the former Portuguese colony and fellow special administrative region of Macau.
Hong Kong was formerly a colony of the British Empire, after the perpetual cession of Hong Kong Island from Qing China at the conclusion of the First Opium War in 1842. The colony expanded to the Kowloon Peninsula in 1860, and further acquired a 99-year lease of the New Territories from 1898. Hong Kong was later occupied by Japan during the Second World War, until British control resumed in 1945. The territory was returned to China under the framework of the Sino-British Joint Declaration, signed by the United Kingdom and China in 1984 and marked with the transfer of sovereignty over Hong Kong in 1997, when it became a special administrative region of the People's Republic of China.
Credit: Wiki
