Duchang county, which belongs to Jiujiang City, Jiangxi Province, is located in the north of Jiangxi Province, near Poyang Lake, in the center of the "Golden Triangle" of Nanchang, Jiujiang and Jingdezhen, with Wushui in the south and the Yangtze River in the north, where Hangrui Expressway, Jiujingqu Railway and Dujiu Expressway meet.
The county covers an area of 2,669.5 square kilometers and governs 24 townships and 259 administrative villages.
By the end of 2020, the permanent population of duchang county was 577,600.