Wallaroo is a port town on the western side of Yorke Peninsula in South Australia, 160 kilometres (100 mi) northwest of Adelaide. It is one of the three Copper Triangle towns famed for their historic shared copper mining industry, and known together as “Little Cornwall”, the other two being Kadina, about 8 kilometres (5 mi) to the east, and Moonta, about 18 kilometres (11 mi) south. In 2016, Wallaroo had a population of 3,988 according to the census held.

Wallaroo is at the western end of the Copper Coast Highway and on the Spencer Highway. The Balaklava-Moonta and Kadina-Brinkworth railway lines closed in the 1990s. From the 1990s until 2009, the Lions Club of Yorke Peninsula Rail operated tourist services between Wallaroo, Kadina and Bute on some Sundays on the previously disused railway line. Grain is transported to the storage near the wharf by road, and loaded to ships by conveyor belts at the Wallaroo jetty. The jetty is also regarded as one of the best scuba diving sites in South Australia. The water is only 5–6 metres deep so can also be enjoyed by snorkelers and free-divers.