ZIP Code 57341
About Gann Valley
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.
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Area Profile
US Census (ACS 5-year · Gazetteer)
154
population
$101,563
median household income
1
people / sq mi
$214,300
median home value
15.6
median age
46
housing units
46
households
248.0
land area (sq mi)