Mount Marshall was an electoral district of the Legislative Assembly in the Australian state of Western Australia from 1930 to 1989.
In 1978, McPharlin joined a breakaway party, known as the National Party (NP), led by future Deputy Premier Hendy Cowan, and won the seat under this banner at the 1980 election.
However, in 1982 he rejoined the National Country Party, who lost the seat for the first time in its history to the Liberals.
[2] Mount Marshall was located in the Eastern Wheatbelt region and, while its exact composition varied over time, it was remarkably stable over its existence when compared with neighbouring electoral districts.
It included the following local government areas: In later years, as populations in the area declined, the District absorbed the rest of Dalwallinu (1966) and the Shires of Cunderdin (1972), Quairading (1972), Goomalling (1977), Wongan-Ballidu (1977), Westonia (1982) and parts of Yilgarn (1982).