Allanson is a town on the banks of the Collie River in the South West region of Western Australia just west of Collie. The Coalfields Highway passes through the town. Land was originally set aside for coal miners so that they could live close to the mines in 1898. A railway station named West Collie opened in the same year. The original townsite, also called West Collie, was gazetted in 1906. The original townsite was later discovered to be placed over commercially viable coal seams so a new townsite was founded in 1911 located a short distance from the original.