Youbeiping Commandery was established by the state of Yan for the defense against the Xiongnu.
[1] In Western Han dynasty, it administered 16 counties: Pinggang (平剛), Wuzhong (無終), Shicheng (石成), Tingling (廷陵), Junmi (俊靡), Ci (薋), Xuwu (徐無), Zi (字), Tuyin (土垠), Bailang (白狼), Xiyang (夕陽), Changcheng (昌城), Licheng (驪成), Guangcheng (廣成), Juyang (聚陽) and Pingming (平明).
[2] In Eastern Han, only 4 counties remained, namely Tuyin, Xuwu, Junmi and Wuzhong, while most of the others were abolished.
[5] In Sui and Tang dynasties, Beiping Commandery became an alternative name of Ping Prefecture (平州).
It administered 3 counties, including Lulong (盧龍), Shicheng (石城) and Macheng (馬城).