It was named for George Fife Angas, a South Australian pioneer politician, banker and pastoralist who played a significant part in the formation and establishment of the Province of South Australia.
Angas was based in eastern and north-eastern rural areas of South Australia including Mount Barker, Murray Bridge, Loxton, Renmark and originally included the township of Angaston on the eastern boundary.
Until 1955 the seat had originally continued north, halfway to the northern border of South Australia.
The seat was proclaimed at the redistribution of 11 May 1949 when the number of Divisions in South Australia increased to 10.
It was first contested at the 1949 federal election [1]and was won by Sir Alexander Russell "Alick" Downer, son of Sir John William Downer a former Premier and Senator of South Australia, who had joined the newly formed Liberal Party of Australia.