Ziebach County, South Dakota

Ziebach County, South Dakota
Ziebach County Courthouse
Location within the U.S. state of South Dakota
Coordinates: 44°59′N 101°40′W / 44.98°N 101.67°W / 44.98; -101.67
Country United States
State South Dakota
Founded1911
Named afterFrank M. Ziebach
SeatDupree
Largest cityDupree
Area
 • Total
1,971 sq mi (5,100 km2)
 • Land1,961 sq mi (5,080 km2)
 • Water9.3 sq mi (24 km2)  0.5%
Population
 (2020)
 • Total
2,413
 • Estimate 
(2024)
2,418
 • Density1.230/sq mi (0.4751/km2)
Time zoneUTC−7 (Mountain)
 • Summer (DST)UTC−6 (MDT)
Congressional districtAt-large

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.