西魏置臨河郡，屬靈州。隋文帝開皇元年（581年）改臨河郡為新昌郡，新昌郡下轄臨河縣，轄境相當今寧夏回族自治區永寧縣北或平羅縣北。開皇三年（583年）隋朝廢除新昌郡，新昌郡、臨河縣併入靈州回樂縣（今寧夏回族自治區靈武市西南）。
參考文獻
- 《中國行政區劃通史·隋代卷》
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