1900
| Retiring Aldermen | |
| William Player | – Re-elected unopposed |
| Thomas Richard Smith | – Re-elected unopposed |
| Frederick Vine | – Re-elected unopposed |
| Elected Aldermen | |
| William Player | – Mayor |
| W H Dukes | |
| J W Dunkley | |
| Edward Haynes | |
| Louis Litton | – Resigned March 1900 |
| Michael Long | – Resigned November 1900 |
| Amos Parker | |
| William Perritt | – Newly elected to replace Louis Litton |
| Charles Randall | – Elected to replace Thomas Richard Smith |
| Thomas Richard Smith | – Resigned September 1900 |
| Frederick Vine | – Resigned November 1900 |
| Francis Henry Woodriff | – Elected to replace Frederick Vine |
| Frederick Daniel Woodriff | – Elected to replace Michael Long |
1901
| Retiring Aldermen | |
| J W Dunkley | – Re-elected |
| Frederick Daniel Woodriff | – Withdraws from contest |
| W H Dukes | – Did not stand for re-election |
| Elected Aldermen | |
| Frederick Daniel Woodriff | – Mayor |
| J W Dunkley | |
| Edward Haynes | |
| Amos Parker | |
| William Perritt | |
| William Player | |
| Charles Randall | |
| Louis Tennant | |
| Ernest King Waldron | – Newly elected |
| Francis Henry Woodriff |
1902
| Retiring Aldermen | |
| William Perritt | – Re-elected |
| Edward Haynes | – Defeated |
| Amos Parker | – Did not stand for re-election |
| Elected Aldermen | |
| Frederick Daniel Woodriff | – Mayor |
| Michael Coffey | – Newly elected |
| J W Dunkley | |
| Michael Long | |
| William Perritt | |
| Charles Randall | |
| Louis Tennant | |
| Ernest King Waldron | |
| Francis Henry Woodriff |
1903
| Retiring Aldermen | |
| Louis Tennant | – Defeated |
| Charles Randall | – Defeated |
| Francis Henry Woodriff | – Did not stand for re-election |
| Elected Aldermen | |
| Michael Long | – Mayor |
| John Blaikie | – Newly elected |
| Michael Coffey | |
| J W Dunkley | |
| Ernest Albert Field | – Newly elected in March 1904 to replace the vacancy Frederick Daniel Woodriff. Resigned in June 1904 |
| Joshua Field | – Newly elected. Had previously served on Castlereagh Council |
| William Perritt | |
| Charles Randall | |
| Frederick Mortimer Vine | – Newly elected in June 1904 to fill the vacancy Ernest Albert Field |
| Ernest King Waldron | – Newly elected |
| Frederick Daniel Woodriff | – Resigned February 1904 |
1904
| Retiring Aldermen | |
| Michael Coffey | – Re-elected unopposed |
| Frederick Mortimer Vine | – Re-elected unopposed |
| Ernest King Waldron | – Defeated |
| Elected Aldermen | |
| Michael Long | – Mayor |
| John Blaikie | |
| Michael Coffey | |
| J W Dunkley | |
| Joshua Field | |
| John Morris Franklin | – Newly elected |
| William Perritt | |
| Charles Randall | |
| Frederick Mortimer Vine |
1905
| Retiring Aldermen | |
| Michael Coffey | – Re-elected unopposed |
| Michael Long | – Re-elected unopposed |
| William Perritt | – Withdrew due to illness |
| Elected Aldermen | |
| Michael Long | – Mayor |
| John Blaikie | |
| Michael Coffey | |
| J W Dunkley | |
| Joshua Field | |
| John Morris Franklin | |
| Edward Edmund Newton Haynes | – Newly elected |
| Charles Randall | |
| Frederick Mortimer Vine |
1906
| Retiring Aldermen | |
| Charles Randall | – Re-elected unopposed |
| John Blaikie | – Did not stand |
| Joshua Field | – Did not stand |
| Elected Aldermen | |
| Michael Long | – Mayor. Resigned in May 1906 |
| Frederick Mortimer Vine | – Elected as Mayor in May 1906 after resignation of Michael Long |
| Frederick Stephen Best | – Elected to replace the vacancy created by the resignation of Michael Long |
| Michael Coffey | |
| J W Dunkley | |
| John Morris Franklin | |
| Edward Edmund Newton Haynes | |
| James Thomas [Thomas James] Huxley | – Newly elected |
| William Perritt | – Newly elected |
| Charles Randall |
1907
| Retiring Aldermen | |
| Michael Coffey | |
| John Morris Franklin | |
| Frederick Mortimer Vine |
| Elected Aldermen | |
| Frederick Stephen Best | – Elected to replace vacancy Michael Long |
| Michael Coffey | |
| J W Dunkley | |
| John Morris Franklin | – Resigned by September 1907 |
| William Henry Withial Hand | – Elected to fill the vacancy created by the vacancy by the resignation of John Morris Franklin |
| Edward Edmund Newton Haynes | |
| James Thomas [Thomas James] Huxley | |
| William Perritt | |
| Charles Randall | |
| Frederick Mortimer Vine | – Mayor |
1908
New legislation came into force on 11 January 1908 which resulted in Aldermen in municipalities and shires being elected for a triennial period.
The Mayor was elected annually.
| Dr Frederick Higgins | – Mayor |
| Thomas Daniel Clissold | |
| William Henry Withial Hand | |
| Arthur William Nepean Judges | |
| Henry J Fulton Neale | |
| Michael Long | |
| Thomas M Masters | |
| Frederick Mortimer Vine | |
| William Shannon Walker |
1909
| Thomas M Masters | |
| Thomas Daniel Clissold | |
| William Henry Withial Hand | |
| Dr Frederick Higgins | |
| Arthur William Nepean Judges | |
| Henry J Fulton Neale | – Mayor |
| Michael Long | |
| Frederick Mortimer Vine | |
| William Shannon Walker |
1910
| Thomas M Masters | |
| Thomas Daniel Clissold | |
| William Henry Withial Hand | |
| Dr Frederick Higgins | |
| Arthur William Nepean Judges | |
| Henry J Fulton Neale | – Mayor |
| Michael Long | |
| Frederick Mortimer Vine | |
| William Shannon Walker |
1911-1913
Triennial Election Year
| Thomas Daniel Clissold | |
| John Eaton | |
| William Henry Withial Hand | |
| James Thomas [Thomas James] Huxley | |
| Thomas Jones | – Mayor |
| Arthur William Nepean Judges | |
| Walter Edward Lance | |
| Frederick Mortimer Vine | |
| William Shannon Walker |
1914
Triennial Election Year
| Michael Coffey | |
| Joshua Field | |
| John Heavey | |
| Charles Frederick Hollier | |
| James Thomas [Thomas James] Huxley | |
| Thomas Jones | – Mayor |
| Arthur William Nepean Judges | |
| Walter Edward Lance | |
| William Shannon Walker |
1915
| Michael Coffey | |
| Joshua Field | |
| David Fitch | – Elected to fill the vacancy created by the resignation of Charles Frederick Hollier |
| John Heavey | |
| Charles Frederick Hollier | – Resigned in January 1915 |
| James Thomas [Thomas James] Huxley | |
| Thomas Jones | – Mayor |
| Arthur William Nepean Judges | |
| Walter Edward Lance | |
| William Shannon Walker |
1916
| Michael Coffey | |
| Joshua Field | |
| David Fitch | – Mayor |
| John Heavey | |
| James Thomas [Thomas James] Huxley | |
| Thomas Jones | |
| Arthur William Nepean Judges | |
| Walter Edward Lance | |
| William Shannon Walker |
1917
Triennial Election Year
| Alfred James Blaikie | |
| Charles Carter | |
| David Fitch | – Mayor |
| William Henry Withial Hand | |
| George Huddleston | |
| Thomas Jones | |
| Walter Edward Lance | |
| Patrick Joseph Quinn | |
| George West |
1918
| Alfred James Blaikie | |
| Charles Carter | |
| David Fitch | |
| William Henry Withial Hand | |
| George Huddleston | – Resigned in September 1918 |
| Thomas Jones | |
| Walter Edward Lance | |
| Patrick Joseph Quinn | – Mayor |
| Frederick Mortimer Vine | – Newly elected to fill the vacancy created by the resignation of George Huddleston |
| George West |
1919
| Alfred James Blaikie | |
| Charles Carter | |
| David Fitch | |
| William Henry Withial Hand | |
| Thomas Jones | – Mayor |
| Walter Edward Lance | |
| Patrick Joseph Quinn | |
| Frederick Mortimer Vine | |
| George West |
1920
Triennial Election Year
| John Adams | |
| Charles Carter | |
| David Fitch | – Mayor |
| William Henry Withial Hand | |
| John Heavey | |
| Thomas Herbert Jolly | |
| Walter Edward Lance | |
| Patrick Joseph Quinn | |
| George West |
1921-1922
| John Adams | – Mayor |
| Charles Carter | |
| David Fitch | |
| William Henry Withial Hand | |
| John Heavey | |
| Thomas Herbert Jolly | |
| Walter Edward Lance | |
| Patrick Joseph Quinn | |
| George West |
1923
Triennial Election year
| John Adams | |
| Francis Joseph Henry Allen | |
| William Henry Dukes | |
| David Fitch | – Mayor |
| Walter Edward Lance | |
| Henry Messer | |
| John Junius Price | |
| Thomas Walter Ransley | |
| William Shannon Walker |
1924
| John Adams | – Resigned in September 1924 |
| Francis Joseph Henry Allen | |
| William Henry Dukes | |
| David Fitch | – Mayor |
| Walter Edward Lance | |
| Henry Messer | |
| James Norman Peek | – Newly elected to fill the vacancy created by the resignation of John Adams |
| John Junius Price | |
| Thomas Walter Ransley | |
| William Shannon Walker |
1925
| Francis Joseph Henry Allen | |
| William Henry Dukes | |
| David Fitch | – Mayor |
| Walter Edward Lance | |
| Henry Messer | |
| James Norman Peek | |
| John Junius Price | – Elected Deputy Mayor in January 1925 |
| Thomas Walter Ransley | |
| William Shannon Walker |
1926
Triennial Election year
| John Adams | – Resigned January 1926 |
| Francis Joseph Henry Allen | |
| William Henry Dukes | |
| David Fitch | – Deputy Mayor |
| Joseph Jenkins | |
| Leslie Markham | |
| Robert Edward Morphett |
– Newly elected to fill the vacancy created by the resignation of John Adams |
| James Norman Peek | |
| John Junius Price | – Mayor |
| William Shannon Walker |
1927
| Francis Joseph Henry Allen | |
| William Henry Dukes | |
| David Fitch | |
| Joseph Jenkins | – Mayor |
| William Baden King |
– Newly elected to fill the vacancy created by the resignation of James Norman Peek |
| Leslie Markham | |
| Robert Edward Morphett | |
| James Norman Peek | – Resigned in November 1927 |
| John Junius Price | – Resigned in December 1927 |
| William Shannon Walker |
1928
| Francis Joseph Henry Allen | – Deputy Mayor |
| Norman Burrow |
– Newly elected to fill the vacancy created by the resignation of Leslie Markham |
| William Henry Dukes | |
| David Fitch | |
| Joseph Jenkins | – Mayor |
| William Baden King |
– Died in office October 1928. No by election held to replace him |
| Leslie Markham | – Resigned in May 1928 |
| Robert Edward Morphett | |
| Arthur Ernest Tuckwell | – Newly elected in January 1928 to fill the vacancy created by the resignation of John Junius Price in December 1927 |
| William Shannon Walker |