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漢安帝時分遼東、遼西兩郡地置，治所在昌黎縣。轄境相當今遼寧省西部大凌河中下游一帶。屬幽州。
烏桓和鮮卑等邊境民族給代，上谷，漁陽等郡帶來的邊患與其設立有密切關係。其管轄區相對於本郡而言，徵稅和勞役的程度較低，漢朝政府通過這種相對寬鬆的制度來安撫這些漢族人口比例較低的地區[1]。
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