The 1904 New South Wales state election involved 90 electoral districts returning one member each. The election was conducted on the basis of a simple majority or first-past-the-post voting system. There were two significant changes from the 1901 election, the first was that women were given the right to vote, which saw an increase in the number of enrolled voters from 345,500 in 1901, to 689,490 in 1904. The second was that as a result of the 1903 New South Wales referendum, the number of members of the Legislative Assembly was reduced from 125 to 90. The combined effect of the changes meant that the average number of enrolled voters per electorate went from 2,764, to 7,661, an increase of 277%. Leichhardt was the only district that was not substantially changed, while The Macquarie and The Murray districts retained nothing but the name.

In this election, in 20 electorates the winning candidate received less than 50% of the votes, while 2 were uncontested. Two seats were contested by 3 sitting members.

Of the 125 members of the house prior to the election, 4 were appointed to the Legislative Council, 10 did not contest the election, and a further 41 were defeated at the election. 70 members (56%) retained a seat after the election.

Election results Albury

Albury lost part of the district to Corowa and was expanded to include part of the abolished seat of The Hume. Thomas Griffith (Independent), the member for Albury, did not contest the election, while Gordon McLaurin (Progressive) was the member for The Hume.

Alexandria

Alexandria was a new seat, comprising parts of the seat of Botany and the abolished seats of Darlington, Newtown-Erskine and Waterloo. John Dacey was the member for Botany who had lost Labour pre-selection for that seat, while George Anderson was the member for the abolished seat of Waterloo. The member for Darlington was Phillip Sullivan (Labour) who successfully contested Phillip while the member for Newtown-Erskine was Robert Hollis (Labour) who successfully contested Newtown.

Allowrie

Allowrie was a new seat comprising the abolished seat of Kiama as well as parts of The Shoalhaven and Illawarra. Mark Morton was the member for The Shoalhaven while Alexander Campbell was the member for Kiama. The member for Illawarra was Edward Allen (Liberal Reform) who unsuccessfully contested Wollongong.

Annandale

Annandale lost parts of the district to The Glebe and Roxelle. It absorbed parts of Petersham and the abolished seat of Newtown-Camperdown. The member for Annandale was William Mahony (Liberal Reform). The member for Petersham was John Cohen (Liberal Reform) who successfully contested that seat while the member for Newtown-Camperdown was James Smith (Independent Progressive) who successfully contested Camperdown.

Armidale

Armidale was expanded to include part of the abolished seat of Uralla-Walcha. Sydney Kearney was the member for Armidale while Michael MacMahon was the member for Uralla-Walcha.

Ashburnham

Ashburnham was one of two seats contested by 3 sitting members. The district lost parts to Belubula and absorbed parts of the abolished seats of Condoublin and Molong. Joseph Reymond had held the seat since the 1898 election as a member of the Progressive Party, however was standing as an independent. The member for Condoublin was Patrick Clara (Labour) and Eden George (Liberal Reform) was the member for the abolished seat of Sydney-Belmore. The member for Molong was Andrew Ross (Independent Liberal) who unsuccessfully contested Orange.

Ashfield

Ashfield lost part of the district to Burwood and was expanded to include part of Petersham. Frederick Winchcombe (Liberal Reform) was the member for Ashfield. The member for Petersham was John Cohen (Liberal Reform) who successfully contested that electorate.

Balmain

Balmain consisted of Balmain North and part of Balmain South. John Storey was the member for the abolished seat of Balmain North, while the member for Balmain South was Sydney Law (Independent Labour) who successfully contested Rozelle.

Bathurst

Bathurst was expanded to include part of The Macquarie. It was held by William Young (Progressive). The member for The Macquarie was William Hurley (Progressive) who was appointed to the Legislative Council.

Bega

Bega was expanded to include part of the abolished district of Eden-Bombala. Henry Clarke (Progressive) was the member for Bega while William Wood (Liberal Reform) was the member for Eden-Bombala.

Belmore

Belmore was a new seat consisted of the abolished seat of Sydney-Belmore and parts of the abolished seats of Sydney-Cook and Sydney-Phillip. The member for Sydney-Belmore was Eden George (Liberal Reform) who successfully contested Ashburnum. The members for Sydney-Cook, Samuel Whiddon (Liberal reform), and Sydney-Phillip, Daniel O'Connor (Progressive), did not contest the election. Edward O'Sullivan (Progressive) was the member for Queanbeyan.

Belubula

Belubula was a new seat consisting of the abolished seat of Cowra and parts of Ashburnum, Orange and the abolished seat of Molong. Thomas Waddell (Progressive) was the member for the abolished seat of Cowra. The member for Orange was Harry Newman (Liberal Reform) who died two months prior to the election. The member for Molong was Andrew Ross (Independent Liberal) who unsuccessfully contested Orange. Thomas Rose (Liberal Reform) was member for the abolished seat of Argyle.

Bingara

Bingara was expanded to include part of Uralla-Walcha. Samuel Moore (Liberal Reform) was the member for Bingara. The member for the abolished seat of Uralla-Walcha was Michael MacMahon (Progressive) who unsuccessfully contested Armidale.

Blayney

Blayney was a new seat consisting of parts of Hartley, The Macquarie and the abolished seat of West Macquarie. Paddy Crick was the member for West Macquarie. The member for Hartley was John Hurley (Independent) who successfully contested that seat while his brother William (Progressive) was the member for The Macquarie who was appointed to the Legislative Council.

Botany

Botany lost part of the district to Randwick and absorbed part of Newtown-St Peters. The member for Botany was John Dacey who, lost Labour pre-selection and successfully contested Alexandria instead. The member for Newtown-St Peters was James Fallick (Independent Liberal) who successfully contested Singleton as an official Liberal Reform candidate.

Broken Hill

Broken Hill absorbed part of the abolished seat of Alma. John Cann (Labour) was the member for Broken Hill. William Williams (Independent Labour), the member for Alma, unsuccessfully contested Sturt as an independent.

Burrangong

Burrangong was a new seat consisting of parts of the abolished seats of Boorowa, Grenfell and Young, each of which were held by the Labour Party. The member for Young was George Burgess. The member for Boorowa was Niels Nielsen who successfully contested Yass and the member for Grenfell was William Holman who successfully contested Cootamundra.

Burwood

Burwood was expanded to include part of Ashfield. The member for Burwood was William Archer (Independent). The member for Ashfield was Frederick Winchcombe (Liberal Reform) who successfully contested that electorate.

Camden

Camden lost part of the district to Wollondilly and absorbed parts of Canterbury and the abolished seats of The Nepean, and Woronora. The member for Camden was John Kidd (Progressive). The member for The Nepean was Thomas Smith who unsuccessfully contested Sherbrooke. The member for Woronora was John Nicholson who successfully contested Wollongong.

Camperdown

Camperdown was a new seat consisting of parts of Annandale and the abolished seats of Newtown-Camperdown, Darlington, Newtown-Camperdown and Newtown-Erskine. James Smith (Progressive) was the member for Newtown-Camperdown. There was a battle for the Liberal pre-selection between William Clegg and John Salmon, with Salmon withdrawing from the process and standing as an independent, splitting the liberal vote.

Canterbury

Canterbury lost part of the district to Camden and Granville. It absorbed parts of Marrickville, Petersham and St George. Thomas Mackenzie (Liberal Reform) was the member for Canterbury. Each of the members for Marrickville. Petersham and St George successfully contested their district.

The Castlereagh

The Castlereagh was a new seat consisting of the abolished seat of Coonamble and part of the abolished seat of Dubbo. The member for Coonamble was Hugh Macdonald (Labour). The member for Dubbo was Simeon Phillips (Liberal Reform) who stayed with the majority of the seat and unsuccessfully contested The Macquarie.

The Clarence

The Clarence lost much of the district to Raleigh and absorbed all of Grafton and a part of Raleigh. The Premier Sir John See (Progressive) was the member for Grafton while John McFarlane (Progressive) was the member for The Clarence. The question of the Progressive candidate was resolved when Sir John See decided to retire due to ill health and accepted an appointment to the Legislative Council.

The Clyde

The Clyde was a new seat which absorbed the whole of whole of the abolished seat of Moruya and parts of the abolished seats of Braidwood and The Shoalhaven. The member for Moruya was William Millard (Liberal Reform). The member for The Shoalhaven was Mark Morton (Liberal Reform) who successfully contested Allowrie. The member for Braidwood was Albert Chapman (Progressive) who did not contest the election.

Cobar

Cobar absorbed parts of The Lachlan and parts of the abolished seats of The Barwon, Condoublin and Wilcannia. The member for The Barwon was William Willis (Progressive) who unsuccessfully contested The Darling. The member for Condoublin was Patrick Clara (Labour) who unsuccessfully contested Ashburnum. The member for The Lachlan was James Carroll (Progressive) who unsuccessfully contested that seat. The member for Wilcannia was Richard Sleath (Independent Labour) who also unsuccessfully contested The Darling.

Cootamundra

Cootamundra was a new seat that consisted of part of The Murrumbidgee, and parts of the abolished seats of Gundagai, Wagga Wagga and Young. John Barnes was the member for Gundagai. The member for The Murrumbidgee was Thomas Fitzpatrick (Progressive) who unsuccessfully contested that seat. The member for Wagga Wagga James Gormly (Progressive) did not contest the election and was appointed to the Legislative Council. The member for Young was George Burgess (Labour) who successfully contested Burrangong. William Holman (Labour) was the member for the abolished seat of Grenfell.

Corowa

Corowa was a new seat comprising parts of Albury, Murray and the abolished seat of The Hume. Gordon McLaurin (Progressive) was the member for The Hume, however he successfully contested Albury, while James Hayes (Progressive), the member for The Murray was appointed to the Legislative Council and did not contest the election.

The Darling

The Darling was a new seat comprising Bourke and parts of The Barwon and Wilcannia electorates. The member for Bourke was William Davis (Progressive) who did not contest the election. The member for The Barwon was William Willis (Progressive) while the member for Wilcannia was Richard Sleath who had initially been elected as a Labour candidate at the 1894 election, but had lost his Labour endorsement prior to the 1901 election which he won as an Independent Labour candidate.

Darling Harbour