吴县
Zhang Wen was from Wu County, Wu Commandery, which is in present-day Suzhou, Jiangsu. The Zhang clan, which he was from, was one of the four most influential clans in Wu Commandery at the time. His father, Zhang Yun (), was famous in Wu Commandery for valuing friendship and having a low regard for material wealth. Zhang Yun also served as an assistant officer under the warlord Sun Quan, who became the founding emperor of Eastern Wu later.