Land in Karkarooc was originally within the
St Arnaud Road District, from 1861 and the
Shire of St Arnaud, from 1864, and then within the
Shire of Borung, after its severance from St Arnaud. Parts of the North and West Ridings of Borung severed on 29 May 1896, to form the Shire of Karkarooc. On 29 May 1897, it annexed the northeastern part of
Shire of Dimboola, and two days later annexed part of
Castle Donnington. On 31 May 1906, it also annexed part of the Tyrrell Riding of the
Shire of Wycheproof. A new shire,
Walpeup, was formed in western Victoria on 1 October 1911, taking in some areas of Karkarooc and sections of five other shires. Karkarooc also lost some of its West Riding to Dimboola on 14 December 1932. On 20 January 1995, the Shire of Karkarooc was abolished, and along with parts of the Shires of
Dunmunkle,
Warracknabeal and
Wimmera, was merged into the newly created
Shire of Yarriambiack.
Ridings At the time of dissolution, Karkarooc was not divided into ridings, and its twelve councillors represented the entire shire. ==Towns and localities==