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Gannvalley is the county seat of Buffalo County and is located north of I-90 along Hwy 45, in Great Lakes Region. It is variously referred to as GannValley or Gann Valley.


South Dakota Counties Buffalo County |

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03/29 Coming to The area
South Dakota BBQ Championships Huron SD May31-June1 Anyone can compete in the backyard BBQ Competition. Meat is provided so you don't need to bring any.
Antique Power Show Huron SD June15-17 Experience the days of antique tractors, cars, steam and stationary gas engines. 150 exhibits and displays, entertainment, demonstrations, flea market, parade and tractor and car games.
Sully County Fair Onida SD August9-12 kicking off the fair with a parade through Onida on Thursday, at 6:27 p.m. The parade will end up at the fairgrounds where we will be having cake, refreshments and music.
Turner County Fair Parker SD August12-15 South Dakota's oldest county fair. The four best days of summer.
Brown County Fair Aberdeen SD August12-18 The Brown County Fair has been providing entertainment and promoting family unity since the 1880s. Enjoy the Dacotah Stampede Rodeo and the demolition derby.