Sioux County is a county located along the southern border of the U.S. state of North Dakota. As of the 2020 census, the population was 3,898, and was estimated to be 3,667 in 2025. Its eastern border is the Missouri River and the county seat is Fort Yates.

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Sioux County

county in North Dakota, United States

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Country: United States
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Facts from Wikidata (CC0). Image by Photographer unidentified via Wikimedia Commons (Public domain).

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Not who you're looking for? Others named Sioux County: county in Iowa, United States · county in Nebraska, United States

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