Electoral results for the district of Middle Harbour

1988 New South Wales state election: Middle Harbour ^[5]

Party		Candidate	Votes	%	±%
	Liberal	Peter Collins	20,147	71.2	+5.2
	Labor	Marilyn Dodkin	8,161	28.8	−1.1
Total formal votes			28,308	96.4	−1.4
Informal votes			1,061	3.6	+1.4
Turnout			29,369	93.4
	Liberal notional hold		Swing	+3.2

1917 New South Wales state election: Middle Harbour ^[6]

Party		Candidate	Votes	%	±%
	Nationalist	Richard Arthur	5,106	59.5	−5.1
	Independent	Alfred Reid	1,904	22.2	+22.2
	Independent	Arthur Keirle	1,568	18.3	+18.3
Total formal votes			8,578	98.8	+1.0
Informal votes			107	1.2	−1.0
Turnout			8,685	53.9	−13.2
	Nationalist hold		Swing	−5.1

1913 New South Wales state election: Middle Harbour ^[7]

Party		Candidate	Votes	%	±%
	Liberal Reform	Richard Arthur	5,785	64.6
	Labor	Ellison Quirk	3,068	34.3
	Independent	James Bray	76	0.9
	Independent	Henry Johnson	29	0.3
Total formal votes			8,958	97.8
Informal votes			205	2.2
Turnout			9,163	67.1
	Liberal Reform hold

1910 New South Wales state election: Middle Harbour ^[8]

Party		Candidate	Votes	%	±%
	Liberal Reform	Richard Arthur	7,554	68.7
	Labour	Stephen O'Brien	2,793	25.4
	Independent Liberal	David Middleton	647	5.9
Total formal votes			10,994	98.7
Informal votes			150	1.3
Turnout			11,144	68.2
	Liberal Reform hold

1907 New South Wales state election: Middle Harbour ^[9]

Party		Candidate	Votes	%	±%
	Liberal Reform	Richard Arthur	5,120	57.2
	Independent Liberal	William Fell	3,674	41.0
	Independent	Thomas Loxton	92	1.0
	Independent	John Hayes	70	0.8
Total formal votes			8,956	98.0
Informal votes			183	2.0
Turnout			9,139	75.9
	Liberal Reform hold

1904 New South Wales state election: Middle Harbour ^[10]

Party		Candidate	Votes	%	±%
	Liberal Reform	Richard Arthur	3,137	58.2
	Ind. Progressive	Ellison Quirk	2,207	41.0
	Socialist Labor	William Gocher	33	0.6
	Independent	Edgar Vanhee	13	0.2
Total formal votes			5,390	99.3
Informal votes			37	0.7
Turnout			5,427	60.5
	Liberal Reform win		(new seat)

Middle Harbour was a new seat and consisted of part of the abolished seat of Warringah and the balance of Warringah was included in St Leonards. The member for Warringah was Ellison Quirk (Independent).