Buffalo County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 1,948. Its county seat is Gann Valley which, at 10 people, is the least populous county seat in the United States. The county was created in 1864, and was organized in 1871 as part of the Dakota Territory. In 2010, the center of population of South Dakota was located in eastern Buffalo County. The Crow Creek Indian Reservation, inhabited by the Crow Creek Sioux Tribe, makes up the majority of Buffalo County. According to the 2013 Small Area Income and Poverty Estimates of the U.S. Census Bureau, about 41% of county residents live in poverty, making it the fifth-poorest county in South Dakota. This is a far higher poverty rate than the national poverty rate of 15.8%. Median household income in 2013 was $21,572, making it the lowest-earning county in South Dakota and the United States.

Founded: 1864 (created), 1871 (organized)
Named for: American buffalo
Seat: Gann Valley
Largest community: Fort Thompson
Total: 488 sq mi (1,263.91 km²)
Land: 471 sq mi (1,219.88 km²)
Water: 16 sq mi (41.44 km²), 3.4
Time zone: Central: UTC-6-5
Official Website: https://gannvalley.com/buffalo-county-1
Wikidata description: county in South Dakota, United States
Wikidata id: Q484450
Wikidata label: Buffalo County
Wikidata aliases: Array
Source
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