Lyon County Fair Grounds: S. 5th Avenue and Tama Street Rock Rapids, IA Directions: From Highway 9: Turn on Tama Street; Go 3 Blocks South From Highway 75: Turn on S. 5th Avenue; Go 8 Blocks East Mailing Address: PO Box 73 Larchwood, IA 51241 Welcome! We are glad you are here! The 2018 Lyon County Fair is July 15 - 20. Welcome 2017 Miss Lyon County Fair Jacee DeVries, Inwood 2017 First Runner Up Katrina Gilbertson, Larchwood 2017 Miss Congeniality Katrina Gilbertson, Inwood © Eu fugiat irure aliqua, tempor eiusmod veniam, culpa laboris non commodo sed enim dolore nulla et aute 2010 Lyon County Fair, Iowa Made with MAGIX