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Dewey County Map, South Dakota

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Dewey County, South Dakota

Dewey Location Map South Dakota

Dewey County is located in north-central South Dakota. The Missouri River forms the eastern border of this county. A large part of the county is within the Cheyenne River Indian Reservation.

Ranching is big business here. You’ll see plenty of cattle grazing on the open plains. The county was named after William P. Dewey, a surveyor.

Timber Lake serves as the county seat. It’s a small, tight-knit community. The landscape is rugged and beautiful. It’s one of the biggest counties in South Dakota in terms of area.

CategoryDetails
County NameDewey County
County SeatTimber Lake
PopulationApproximately 5,300
Cities, Towns, and CommunitiesTimber Lake, Eagle Butte, Isabel, Glencross, Lantry
Interstates and HighwaysU.S. Highway 212
FIPS Code46-041
Total Area (Land and Water)2,345 square miles (2,302 sq mi land, 43 sq mi water)
Adjacent Counties (and Direction)Corson County (North), Walworth County (Northeast), Potter County (East), Sully County (Southeast), Stanley County (South), Ziebach County (West)
Time ZoneMountain Time Zone (MST)
StateSouth Dakota
Coordinates45°16’N, 100°42’W
EtymologyNamed after William P. Dewey, a territorial legislator
Major LandmarksCheyenne River Indian Reservation, Timber Lake Museum

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