The area now covered by North Sydney Council originally comprised three municipalities: the Borough of East St Leonards from 1860 (Kirribilli, Cremorne Point, Milsons Point), the Borough of St Leonards from 1867 (Cammeray, Mosman, Waverton, Wollstonecraft) and the very small Borough of Victoria from 1871 (McMahons Point and parts of North Sydney and Lavender Bay).
[3] Following a petition submitted by residents in 1892, on 11 April 1893 the Mossman Ward of North Sydney confirmed its separation as the Borough of Mosman, being proclaimed by Lieutenant-Governor Sir Frederick Darley.
[4] From 28 December 1906, following the passing of the Local Government Act, 1906, the council was renamed as the "Municipality of North Sydney".
The following individuals has served as the mayor of North Sydney Council, or any predecessor titles: The position of deputy mayor was made a permanent council position when the Local Government Act 1919 came into effect from 1 January 1920.
[130][131] The following individuals have been elected as deputy mayor of North Sydney: ^a : Grandson of James Milson (1783–1872).