Gann Valley, South Dakota

Gann Valley is a census-designated place in and the county seat of Buffalo County, South Dakota, United States. The town had a population of 10 as of the 2020 census. It is the smallest unincorporated county seat in the United States.

Gann Valley
Unincorporated community
Gann Valley
Location within the state of South Dakota
Gann Valley
Gann Valley (the United States)
Coordinates: 44°02′01″N 98°59′18″W
CountryUnited States
StateSouth Dakota
CountyBuffalo
Founded1885
Area
  Total0.08 sq mi (0.21 km2)
  Land0.08 sq mi (0.21 km2)
  Water0.00 sq mi (0.00 km2)
Elevation
1,716 ft (523 m)
Population
 (2020)
  Total10
  Density126.58/sq mi (48.68/km2)
Time zoneUTC-6 (Central (CST))
  Summer (DST)UTC-5 (CDT)
ZIP codes
57341
Area code605
FIPS code46-23421
GNIS feature ID2584554
Websitehttp://www.gannvalley.com/
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