Electoral results for the district of Cook's River

1971 New South Wales state election: Cook's River [5]

Party		Candidate	Votes	%	±%
	Labor	Tom Cahill	17,427	66.1	+1.0
	Liberal	Kenneth McKimm	8,920	33.9	-1.0
Total formal votes			26,347	96.3
Informal votes			1,010	3.7
Turnout			27,357	92.2
	Labor hold		Swing	+1.0

1968 New South Wales state election: Cook's River [6]

Party		Candidate	Votes	%	±%
	Labor	Tom Cahill	17,821	69.2	-0.7
	Liberal	James Harris	7,962	30.9	+0.7
Total formal votes			25,783	96.6
Informal votes			895	3.4
Turnout			26,678	93.3
	Labor hold		Swing	-0.7

1965 New South Wales state election: Cook's River [7]

Party		Candidate	Votes	%	±%
	Labor	Thomas Cahill	15,675	69.8	−4.6
	Liberal	Louis Mamo	6,774	30.2	+4.6
Total formal votes			22,449	97.5	−0.9
Informal votes			564	2.5	+0.9
Turnout			23,013	94.7	−0.5
	Labor hold		Swing	−4.6

1962 New South Wales state election: Cook's River [8]

Party		Candidate	Votes	%	±%
	Labor	Tom Cahill	17,447	74.4	+3.5
	Liberal	Sidney Pitkethly	5,999	25.6	+1.3
Total formal votes			23,446	98.4
Informal votes			389	1.6
Turnout			23,835	95.2
	Labor hold		Swing	−0.1

1959 Cook's River by-election
Saturday 12 December [9]

Party		Candidate	Votes	%	±%
	Labor	Tom Cahill	14,283	72.55	+1.61
	Liberal	John Bampton	4,488	22.80	-1.45
	Communist	Walter Buckley	916	4.65	+4.65
Total formal votes			19,687
Informal votes			364	1.82
Turnout			20,051	84.48
	Labor hold		Swing	+1.61

Joseph Cahill (Labor) died. The Labor Party retained the seat on an improved margin, which was nonetheless significant due to the large personal vote for Cahill and sympathy after his death which was then carried by his son.[9]

1959 New South Wales state election: Cook's River [10]

Party		Candidate	Votes	%	±%
	Labor	Joseph Cahill	16,111	70.9
	Liberal	Athol McCoy	5,507	24.2
	Independent	Charles Higbid	1,094	4.8
Total formal votes			22,712	98.3
Informal votes			392	1.7
Turnout			23,104	95.3
Two-party-preferred result
	Labor	Joseph Cahill	16,931	74.5
	Liberal	Athol McCoy	5,781	25.5
	Labor hold		Swing

1956 New South Wales state election: Cook's River [11]

Party		Candidate	Votes	%	±%
	Labor	Joseph Cahill	13,591	65.2	−34.8
	Independent	William Kendrick	4,135	19.8	+19.8
	Liberal	James Skehan	2,302	11.0	+11.0
	Communist	Edward Rowe	830	4.0	+4.0
Total formal votes			20,858	97.6
Informal votes			516	2.4
Turnout			21,374	94.6
Two-candidate-preferred result
	Labor	Joseph Cahill	14,751	70.7	−29.3
	Independent	William Kendrick	6,107	29.3	+29.3
	Labor hold		Swing	N/A

1953 New South Wales state election: Cook's River [12]

Party		Candidate	Votes	%	±%
	Labor	Joseph Cahill	unopposed
	Labor hold		Swing

1950 New South Wales state election: Cook's River [13]

Party		Candidate	Votes	%	±%
	Labor	Joseph Cahill	15,878	74.6
	Liberal	Donald Clark	4,774	22.4
	Independent	Henry McPhillips	624	2.9
Total formal votes			21,276	97.9
Informal votes			454	2.1
Turnout			21,730	95.1
Two-party-preferred result
	Labor	Joseph Cahill		75.0 [lower-alpha 1]
	Liberal	Donald Clark		25.0
	Labor hold		Swing

1947 New South Wales state election: Cook's River [14]

Party		Candidate	Votes	%	±%
	Labor	Joseph Cahill	13,972	65.6	-34.4
	Lang Labor	John Hamilton	7,337	34.4	+34.4
Total formal votes			21,309	96.8
Informal votes			708	3.2
Turnout			22,017	95.4
	Labor hold		Swing	N/A

1944 New South Wales state election: Cook's River [15]

Party		Candidate	Votes	%	±%
	Labor	Joseph Cahill	unopposed
	Labor hold		Swing

1941 New South Wales state election: Cook's River [16]

Party		Candidate	Votes	%	±%
	Labor	Joseph Cahill	13,616	73.9
	Independent Labor	John Simpson	4,804	26.1
Total formal votes			18,420	95.5
Informal votes			877	4.5
Turnout			19,297	94.0
	Labor hold		Swing