沛県
Zhou Bo's ancestral home was in Juan County (; present-day Yuanyang County, Henan) but he was born in Pei County in present-day Jiangsu. He was a friend of Liu Bang (Emperor Gaozu), the founding emperor of the Han dynasty. Around 206 BC, he joined Liu Bang in rebelling against the Qin dynasty. After the fall of the Qin dynasty, Zhou Bo fought on Liu Bang's side in the Chu–Han Contention against Liu Bang's rival, Xiang Yu.