Longkou (Chinese: 龍口; pinyin: Lóngkǒu), formerly Huang County (Chinese: 黄县; pinyin: Huáng Xiàn), is a port city in northeastern Shandong Province, on the eastern coast of the People's Republic of China. Longkou, a county-level city, is administered by the prefecture-level city of Yantai. The total population of Longkou is 620,000.