Australian House of Representatives elections use full-preferential voting: voters number every box. If no candidate has more than half the first-preference votes, the candidate with the fewest is excluded and their ballots pass to each voter’s next preference, repeating until someone has more than half. Practical lesson: rank the candidate you most want to win first and the one you most want to lose last.
Mark DREYFUS (Australian Labor Party) won Isaacs in 2025 with 69,604 of the 108,181 votes in the final count, beating Fiona OTTEY (Liberal) by 31,027 votes (64.3% to 35.7%). Dreyfus led on first preferences with 49.4% of 108,181 formal votes and passed the 54,091-vote majority at count 1.
108,181 formal votes5 candidates3 counts31,027-vote final margin
Each column is a count. Bar height = votes held; the candidate with the fewest votes is excluded and their votes flow to the others. Hover or tap a candidate to highlight their flows.
What happened, count by count
Initially 108,181 first-preference votes were counted. The candidate with the fewest votes is excluded and their votes pass to the voters' next preference, and so on until two remain.
On count 1, Audrey HARMSE (Family First) was excluded; their 3,878 votes were distributed: 1,445 (37.3%) to Geoff McMAHON; 892 (23.0%) to Fiona OTTEY; 869 (22.4%) to Matthew KIRWAN; 672 (17.3%) to Mark DREYFUS.
On count 2, Geoff McMAHON (Pauline Hanson's One Nation) was excluded; their 6,434 votes were distributed: 4,411 (68.6%) to Fiona OTTEY; 1,049 (16.3%) to Matthew KIRWAN; 974 (15.1%) to Mark DREYFUS.
On count 3, Matthew KIRWAN (The Greens) was excluded; their 17,118 votes were distributed: 14,504 (84.7%) to Mark DREYFUS; 2,614 (15.3%) to Fiona OTTEY.
Finally, Mark DREYFUS (Australian Labor Party) won with 69,604 votes to 38,577 for Fiona OTTEY (Liberal).
Where the preferences went
Isaacs 2025: where each excluded candidate’s votes went
Count
Excluded
Votes distributed
Passed to
1
Audrey HARMSEFamily First
3,878
Geoff McMAHON (ON): 1,445 (37.3%)
Fiona OTTEY (LP): 892 (23.0%)
Matthew KIRWAN (GVIC): 869 (22.4%)
Mark DREYFUS (ALP): 672 (17.3%)
2
Geoff McMAHONPauline Hanson's One Nation
6,434
Fiona OTTEY (LP): 4,411 (68.6%)
Matthew KIRWAN (GVIC): 1,049 (16.3%)
Mark DREYFUS (ALP): 974 (15.1%)
3
Matthew KIRWANThe Greens
17,118
Mark DREYFUS (ALP): 14,504 (84.7%)
Fiona OTTEY (LP): 2,614 (15.3%)
Votes after every count
Isaacs 2025: votes held by each candidate after every count (– = excluded)
Candidate
First prefs
Count 1
Count 2
Count 3
Mark DREYFUSAustralian Labor Party · elected
53,454
54,126
55,100
69,604
Fiona OTTEYLiberal
30,660
31,552
35,963
38,577
Matthew KIRWANThe Greens
15,200
16,069
17,118
–
Geoff McMAHONPauline Hanson's One Nation
4,989
6,434
–
–
Audrey HARMSEFamily First
3,878
–
–
–
2022 Federal election
Mark DREYFUS (Australian Labor Party) won Isaacs in 2022 with 55,818 of the 98,184 votes in the final count, beating Robbie BEATON (Liberal) by 13,452 votes (56.9% to 43.1%). Dreyfus led on first preferences with 40.0% of 98,184 formal votes and passed the 49,093-vote majority at count 5.
98,184 formal votes7 candidates5 counts13,452-vote final margin
Each column is a count. Bar height = votes held; the candidate with the fewest votes is excluded and their votes flow to the others. Hover or tap a candidate to highlight their flows.
What happened, count by count
Initially 98,184 first-preference votes were counted. The candidate with the fewest votes is excluded and their votes pass to the voters' next preference, and so on until two remain.
On count 1, Alix LIVINGSTONE (Animal Justice Party) was excluded; their 2,259 votes were distributed: 1,127 (49.9%) to Alex BRESKIN; 357 (15.8%) to Mark DREYFUS; 279 (12.4%) to Scott Anson McCAMISH; 186 (8.2%) to Robbie BEATON and 2 more.
On count 2, Boris SOKIRANSKY (Pauline Hanson's One Nation) was excluded; their 3,309 votes were distributed: 1,268 (38.3%) to Scott Anson McCAMISH; 776 (23.5%) to Sarah O'DONNELL; 708 (21.4%) to Mark DREYFUS; 353 (10.7%) to Robbie BEATON and 1 more.
On count 3, Sarah O'DONNELL (Liberal Democrats) was excluded; their 5,692 votes were distributed: 2,680 (47.1%) to Scott Anson McCAMISH; 1,778 (31.2%) to Robbie BEATON; 789 (13.9%) to Mark DREYFUS; 445 (7.8%) to Alex BRESKIN.
On count 4, Scott Anson McCAMISH (United Australia Party) was excluded; their 9,082 votes were distributed: 5,249 (57.8%) to Robbie BEATON; 2,244 (24.7%) to Alex BRESKIN; 1,589 (17.5%) to Mark DREYFUS.
On count 5, Alex BRESKIN (The Greens) was excluded; their 16,641 votes were distributed: 13,147 (79.0%) to Mark DREYFUS; 3,494 (21.0%) to Robbie BEATON.
Finally, Mark DREYFUS (Australian Labor Party) won with 55,818 votes to 42,366 for Robbie BEATON (Liberal).
Where the preferences went
Isaacs 2022: where each excluded candidate’s votes went
Count
Excluded
Votes distributed
Passed to
1
Alix LIVINGSTONEAnimal Justice Party
2,259
Alex BRESKIN (GVIC): 1,127 (49.9%)
Mark DREYFUS (ALP): 357 (15.8%)
Scott Anson McCAMISH (UAPP): 279 (12.4%)
Robbie BEATON (LP): 186 (8.2%)
Boris SOKIRANSKY (ON): 179 (7.9%)
Sarah O'DONNELL (LDP): 131 (5.8%)
2
Boris SOKIRANSKYPauline Hanson's One Nation
3,309
Scott Anson McCAMISH (UAPP): 1,268 (38.3%)
Sarah O'DONNELL (LDP): 776 (23.5%)
Mark DREYFUS (ALP): 708 (21.4%)
Robbie BEATON (LP): 353 (10.7%)
Alex BRESKIN (GVIC): 204 (6.2%)
3
Sarah O'DONNELLLiberal Democrats
5,692
Scott Anson McCAMISH (UAPP): 2,680 (47.1%)
Robbie BEATON (LP): 1,778 (31.2%)
Mark DREYFUS (ALP): 789 (13.9%)
Alex BRESKIN (GVIC): 445 (7.8%)
4
Scott Anson McCAMISHUnited Australia Party
9,082
Robbie BEATON (LP): 5,249 (57.8%)
Alex BRESKIN (GVIC): 2,244 (24.7%)
Mark DREYFUS (ALP): 1,589 (17.5%)
5
Alex BRESKINThe Greens
16,641
Mark DREYFUS (ALP): 13,147 (79.0%)
Robbie BEATON (LP): 3,494 (21.0%)
Votes after every count
Isaacs 2022: votes held by each candidate after every count (– = excluded)
Candidate
First prefs
Count 1
Count 2
Count 3
Count 4
Count 5
Mark DREYFUSAustralian Labor Party · elected
39,228
39,585
40,293
41,082
42,671
55,818
Robbie BEATONLiberal
31,306
31,492
31,845
33,623
38,872
42,366
Alex BRESKINThe Greens
12,621
13,748
13,952
14,397
16,641
–
Scott Anson McCAMISHUnited Australia Party
4,855
5,134
6,402
9,082
–
–
Sarah O'DONNELLLiberal Democrats
4,785
4,916
5,692
–
–
–
Boris SOKIRANSKYPauline Hanson's One Nation
3,130
3,309
–
–
–
–
Alix LIVINGSTONEAnimal Justice Party
2,259
–
–
–
–
–
2019 Federal election
Mark DREYFUS (Australian Labor Party) won Isaacs in 2019 with 54,645 of the 96,837 votes in the final count, beating Jeremy HEARN (Liberal) by 12,453 votes (56.4% to 43.6%). Dreyfus led on first preferences with 44.8% of 96,837 formal votes and passed the 48,419-vote majority at count 4.
96,837 formal votes6 candidates4 counts12,453-vote final margin
Each column is a count. Bar height = votes held; the candidate with the fewest votes is excluded and their votes flow to the others. Hover or tap a candidate to highlight their flows.
What happened, count by count
Initially 96,837 first-preference votes were counted. The candidate with the fewest votes is excluded and their votes pass to the voters' next preference, and so on until two remain.
On count 1, Ash PUVIMANASINGHE (Rise Up Australia Party) was excluded; their 1,142 votes were distributed: 402 (35.2%) to Jeremy HEARN; 269 (23.6%) to Tony SEALS; 237 (20.8%) to Bronwyn CURRIE; 128 (11.2%) to Kim SAMIOTIS and 1 more.
On count 2, Bronwyn CURRIE (Animal Justice Party) was excluded; their 3,844 votes were distributed: 1,685 (43.8%) to Kim SAMIOTIS; 939 (24.4%) to Mark DREYFUS; 648 (16.9%) to Jeremy HEARN; 572 (14.9%) to Tony SEALS.
On count 3, Tony SEALS (United Australia Party) was excluded; their 4,654 votes were distributed: 2,630 (56.5%) to Jeremy HEARN; 1,093 (23.5%) to Mark DREYFUS; 931 (20.0%) to Kim SAMIOTIS.
On count 4, Kim SAMIOTIS (The Greens (VIC)) was excluded; their 13,566 votes were distributed: 9,143 (67.4%) to Mark DREYFUS; 4,423 (32.6%) to Jeremy HEARN.
Finally, Mark DREYFUS (Australian Labor Party) won with 54,645 votes to 42,192 for Jeremy HEARN (Liberal).
Where the preferences went
Isaacs 2019: where each excluded candidate’s votes went
Count
Excluded
Votes distributed
Passed to
1
Ash PUVIMANASINGHERise Up Australia Party
1,142
Jeremy HEARN (LP): 402 (35.2%)
Tony SEALS (UAPP): 269 (23.6%)
Bronwyn CURRIE (AJP): 237 (20.8%)
Kim SAMIOTIS (GVIC): 128 (11.2%)
Mark DREYFUS (ALP): 106 (9.3%)
2
Bronwyn CURRIEAnimal Justice Party
3,844
Kim SAMIOTIS (GVIC): 1,685 (43.8%)
Mark DREYFUS (ALP): 939 (24.4%)
Jeremy HEARN (LP): 648 (16.9%)
Tony SEALS (UAPP): 572 (14.9%)
3
Tony SEALSUnited Australia Party
4,654
Jeremy HEARN (LP): 2,630 (56.5%)
Mark DREYFUS (ALP): 1,093 (23.5%)
Kim SAMIOTIS (GVIC): 931 (20.0%)
4
Kim SAMIOTISThe Greens (VIC)
13,566
Mark DREYFUS (ALP): 9,143 (67.4%)
Jeremy HEARN (LP): 4,423 (32.6%)
Votes after every count
Isaacs 2019: votes held by each candidate after every count (– = excluded)
Candidate
First prefs
Count 1
Count 2
Count 3
Count 4
Mark DREYFUSAustralian Labor Party · elected
43,364
43,470
44,409
45,502
54,645
Jeremy HEARNLiberal
34,089
34,491
35,139
37,769
42,192
Kim SAMIOTISThe Greens (VIC)
10,822
10,950
12,635
13,566
–
Tony SEALSUnited Australia Party
3,813
4,082
4,654
–
–
Bronwyn CURRIEAnimal Justice Party
3,607
3,844
–
–
–
Ash PUVIMANASINGHERise Up Australia Party
1,142
–
–
–
–
About this page
Australian House of Representatives elections use full-preferential voting: voters number every box. If no candidate has more than half the first-preference votes, the candidate with the fewest is excluded and their ballots pass to each voter’s next preference, repeating until someone has more than half. Practical lesson: rank the candidate you most want to win first and the one you most want to lose last.
