 The Shire of Nungarin originated as the Nungarin Road District, which was gazetted on 24 March 1921.It was originally much larger, extending north into what is now the Shire of Mount Marshall until losing a section to that road board on 6 July 1923.In 1933, it included the Bonnie Rock, Campion, Lake Brown, Mukinbudin and Wilgoyne districts, with an area of 1708 square miles.