Established on 12 January 1875 and organized on 23 February 1875. County seat was initially at Goose River (now Caledonia) and then relocated to Hillsboro in 1896. Named for Walter John Strickland Traill, a Hudson Bay employee who had immigrated from Winnipeg, Canada and became a prominent farmer, grain shipper, and land developer.
Traill County Population (2000): 8,477
861 Square Miles
County Seat: Hillsboro
Rivers: Goose (middle of county) and Elm (southern part of county)
Colleges: Mayville State University, Mayville
Cities:Hatton, Hillsboro, Mayville