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Sioux County, North Dakota

US county information
NameSioux County
StateNorth Dakota
SeatFort Yates
Largest cityCannon Ball
US Area
Total Area1128 sq mi (2921.5 km2)
Land Area1094 sq mi (2833.5 km2)
Water Area34 sq mi (88.1 km2)
Population4153 (2010)
Density1/km2 (2.6/sq mi)

     Home | County | Sioux County North Dakota

Sioux County is a county located in the U.S. state of North Dakota. As of 2010, the population was 4,153. Its county seat is Fort Yates.

The county lies entirely within the Standing Rock Indian Reservation, forming the northernmost 30 percent of the reservation. (The balance of the reservation is in South Dakota). It is the only county in North Dakota that is entirely within an Indian reservation.

The county was created by proclamation of Governor Louis B. Hanna on September 3, 1914 and named after the Native Americans who live on the reservation. The county government was first organized on September 12, 1914; Fort Yates has always been the county seat.

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