The townsite of Pinjarra is located in the south west agricultural region, 87 km south of Perth and 21 km south east of Mandurah. It is located near a ford over the Murray River, and land was reserved for a townsite here in 1831. Surveys were carried out in 1836 and land allocated to settlers in 1837. The name was often shown spelt "Pinjarrup" on early maps, and the accepted spelling for many years was "Pinjarrah". There are conflicting theories regarding the meaningof this Aboriginal name. It is usually said to mean "place of a swamp", but it is more likely named after the "Pindjarup" tribe, the Aboriginal group that frequented this area.