Pei County
Chen Deng's ancestral home (and probably birthplace too) was in Huaipu County (), Xiapi Commandery (), Xu Province (), which is present-day Lianshui County, Jiangsu. He was born in a family of government officials. His granduncle, Chen Qiu (), held high-ranking positions in the Han government during the reign of Emperor Ling. Chen Qiu's sons, Chen Yu () and Chen Cong (), served as commandery administrators. Chen Deng's father, Chen Gui, was the Chancellor () of Pei State (沛國; around present-day Pei County, Jiangsu).