Hallett is a small town in Mid North region of South Australia, situated on the Barrier Highway and former Peterborough railway line 32 kilometres (20 mi) north of Burra and 38 kilometres (24 mi) south-east of Jamestown, Hallett lies close to Goyder's Line, plotted in the nineteenth century by George Goyder, separating the land suitable for cropping from the land suitable for grazing. At the 2011 census, Hallett shared a population of 235 with adjoining localities. The historic is listed on the South Australian Heritage Register.