杨县，西汉置杨县，属河东郡。王莽改名有年亭，东汉仍为杨县。晋仍名杨县，属平阳府，后废。北魏初为平阳郡治，太和二十年(487年)复置杨县，属永安郡。东魏属晋州。隋属临汾郡，义宁元年(617年)改名洪洞县[1]。
参考资料
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