Ziebach County

Also known as Ziebach County, South Dakota, Ziebach County, SD

county in South Dakota, United States of America

Key facts

Country: United States
State: South Dakota
Named after: Frank M. Ziebach
Seat: Dupree
Largest city: Dupree
Total: 1,971 sq mi (5,100 km )
Land: 1,961 sq mi (5,080 km )
Water: 9.3 sq mi (24 km ) 0.5%
Estimate 2025: 2,389
Density: 1.230/sq mi (0.4751/km )
Time zone: UTC−7 ( Mountain )
Summer dst: UTC−6 ( MDT )
Congressional district

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Article

Ziebach County (Zee-bahk) is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 2,413. Its county seat is Dupree. It is the last county (or county equivalent) in the United States alphabetically.

Ziebach County consists entirely of Indian reservations. Most of the county is within the Cheyenne River Indian Reservation and the remainder is within the Standing Rock Sioux Reservation.