因為今陝西省咸陽市彬州市的新平郡被北魏占領，南朝宋宋明帝泰始七年（471年）僑置新平郡，治所在江陽縣（在今江蘇省南通市海安市一帶）。沒有實土，之後被廢除。
參考文獻
- 《中國行政區劃通史·三國兩晉南朝卷》
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