The division was proclaimed in 1900, and was one of the original 65 divisions to be contested at the first Federal election. The division was named after the Wannon River. For the first half-century after Federation, it regularly traded hands between the Australian Labor Party and the conservative parties. However, a 1955 redistribution removed most of the seat's Labor-friendly territory, and it has been a safe Liberal seat for most of its history since then.
The seat's most notable member was Prime Minister Malcolm Fraser, to date the last prime minister from a country seat. His successor, David Hawker, was Speaker of the Australian House of Representatives during the last term of the Howard Government. Hawker retired in 2010 and was succeeded by Dan Tehan.
The division is located in the south-west of the state, and encompasses most of the Western District of the state. It adjoins the South Australian border in the west, and the Bass Strait coast in the south. The division encompasses the towns of Warrnambool, Portland, Ararat, Hamilton and Halls Gap. The Grampians and the Port Campbell National Parks are in the division. Maryborough and Avoca became part of Wannon at the 2013 federal election due to a redistribution that took place on 24 December 2010.
|United Australia||Joshua Wallace||6,258||6.02||+6.02|
|Total formal votes||103,889||96.15||+0.55|
- Wannon, VIC, Tally Room 2019, Australian Electoral Commission.