 From 1973 to 2014, the council was elected by thirds every year except the year in which county council elections took place in other parts of England.In 2015, the whole council was elected due to boundary changes to the wards and it was decided that the whole council would be elected every four years from 2017, so that the council elections would coincide with the election of the Mayor of Doncaster.Since the first election to the council in 1973 political control of the council has been held by the following parties