北魏末年置中陽郡，隸屬於南汾州，治所在昌寧縣（今山西鄉寧縣西），東魏時下轄洛陵縣、昌寧縣，北齊沿置，北周下轄昌寧一縣。轄境相當今山西省鄉寧縣一帶。隋文帝開皇元年（581年）改為內陽郡，開皇三年（583年），廢除內陽郡，昌寧縣直屬南汾州。
參考文獻
- 《中國行政區劃通史·十六國北朝卷》
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