Welcome to the website of The Williamson County Fair! It is held annually on the Willamson County Fairgrounds in Marion Illinois. If you're looking the Williamson County Fair in Franklin Tennessee, you can find them here: Williamson County Fair, Franklin TN The Williamson County Fair would like to thank: Bayer Syngenta Koerner Distributors Life-Line Ambulance Golden Eagle Distributors Monsanto Crop Protection Black Diamond Harley-Davidson Williamson County Sheriff's Auxiliary Evrard-Strang Construction Company Johnston City Lake Creek Masonic Lodge Williamson County Fire Protection District Marion High School Pom-Pon Squad & Parents All the patient people who came to see Justin Moore And all of our helpers, both paid and unpaid... We'd like to thank you all for your time, effort, patience, and dedication in helping to create another successful, outstanding, and memorable year at the Williamson County Fair!