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北魏永安年间，改新兴郡为永安郡，故治在今定襄县（今山西定襄县）。领五县：定襄、阳曲、平寇、蒲子、驴夷。22748户，104185口。[1][2]辖境相当今山西忻州市及定襄县、五台县、阳曲县、静乐县、盂县等地。北齐废永安郡。
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