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August 1523 2025 The Allen County Fairgrounds offers year round entertainment The Allen County Fairgrounds are home to some of the biggest events in Allen County Ohio including the annual Allen County Fair which sees more than 200000 visitors. The Allen County Fairgrounds boasts one of the finest fair facilities in the state and is run by a fulltime staff who manages a yearround event schedule. Through offseason rental of the grounds and buildings the fairgrounds hosts the Ohio National Championship Motorcycle races Maxs Trader Days and Water Dog Races King of Ohio Demolition Derby in addition to a variety of craft shows swap meets gun shows flea markets concerts horse shows and cattle shows. Celebrating 175 Years We invite you to join us in celebrating the 175th Allen County Fair.