It was located in modern eastern Hebei and western Liaoning, to the west of the Liao River.
In Western Han dynasty, It administered 14 counties, including Qielü (且慮), Haiyang (海陽), Xin'anping (新安平), Liucheng (柳城), Lingzhi (令支), Feiru (肥如), Bincong (賓從), Jiaoli (交黎), Yangle (陽樂), Husu (狐蘇), Tuhe (徒河), Wencheng (文成), Linyu (臨渝) and Lei (絫).
Five counties remained, including Yangle, Haiyang, Lingzhi, Feiru and Linyu.
[2] In 280 AD, the commandery had 3 counties, namely Yangle, Feiru and Haiyang, and a population of 2,800 households.
[4] Liaoxi Commandery was reestablished in Sui dynasty, and later became an alternative name of Ying Prefecture (營州).