Sioux County, IowaEdit This Page
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1851--Sioux County was created 15 January 1851 from unorganized territory. It was attached to Woodbury County prior to organization 1 January 1860. County seat: Orange City 
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- ↑ The Handybook for Genealogists: United States of America,10th ed. (Draper, UT:Everton Publishers, 2002).
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