The Hundred of Tarcowie is a cadastral unit of hundred located on the south western slopes of the Narien Range in the Mid North of South Australia spanning the township of Tarcowie, the locality of Hornsdale, and surrounds.[1] One of the 12 hundreds of the County of Dalhousie, it was proclaimed in 1871 by Governor James Fergusson and named for an indigenous term thought to mean 'wash away water'.[1]