Zhangwu County is a county in the north of Liaoning province, China. It is under the administration of Fuxin City, the centre of which lies 82 kilometres (51 mi) to the southwest, with a population of 333,643 in 2020 residing in an area of 3,635 km2 (1,403 sq mi). It is served by G25 Changchun–Shenzhen Expressway, G2511 Xinmin–Lubei Expressway, and China National Highways 101 and 304.