楊縣,西漢置楊縣,屬河東郡。王莽改名有年亭,東漢仍為楊縣。晉仍名楊縣,屬平陽府,後廢。北魏初為平陽郡治,太和二十年(487年)復置楊縣,屬永安郡。東魏屬晉州。隋屬臨汾郡,義寧元年(617年)改名洪洞縣[1]

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