Symonston is a primarily industrial and agricultural suburb of Canberra. Symonston is named after Sir Josiah Symon a Legislator, Federalist and one of the Founders of the Constitution of Australia.
Located in Symonston are the Alexander Maconochie Centre (gaol), Periodic Detention Centre and Symonston Temporary Remand Centre and three caravan parks: Canberra South Motor Park, Sundown Village and Narrabundah Longstay Caravan Park. Geoscience Australia has its headquarters in Symonston.
The Symonston area has traditionally been denoted ‘Broadacre’ area by the planning authorities, meaning that it has retained a traditionally rural character with some larger institution uses, particularly by the Australian Defence Force and Geoscience Australia. With the release of the Canberra Spatial Plan by the ACT Government, the area and the adjoining Majura Valley has been denoted as an employment corridor centred on Canberra Airport and Fyshwick.