# West Mayo (UK Parliament constituency)

West Mayo was a parliamentary constituency in Ireland, which returned one Member of Parliament (MP) to the House of Commons of the Parliament of the United Kingdom, elected on a system of first-past-the-post, from 1885 to 1922.
Prior to the 1885 general election the area was part of the two-seat Mayo constituency. From 1922, on the establishment of the Irish Free State, it was not represented in the UK Parliament.

## Boundaries

This constituency comprised the western part of County Mayo.
1885–1922: The baronies of Burrishoole and Murrisk, and that part of the barony of Carra not contained within the constituency of South Mayo.

## Members of Parliament

| Years | Member | Party |
| 1885–1890 | John Deasy | Irish Parliamentary Party |
| 1891–1893 | John Deasy | Irish National Federation |
| 1893–1900 | Robert Ambrose | Irish National Federation |
| 1900–1910 | Robert Ambrose | Irish Parliamentary Party |
| 1910–1918 | William Doris | Irish Parliamentary Party |
| 1918–1922 | Joseph MacBride | Sinn Féin |

## Elections
### Elections in the 1880s

1885 general election: West Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | John Deasy | 4,790 | 97.3 | |
| | Irish Conservative | Robert Vesey Stoney | 131 | 2.7 | |
| Majority | Majority | Majority | 4,659 | 94.6 | |
| Turnout | Turnout | Turnout | 4,921 | 61.4 | |
| Registered electors | Registered electors | Registered electors | 8,009 | | |
| | Irish Parliamentary win (new seat) | Irish Parliamentary win (new seat) | Irish Parliamentary win (new seat) | Irish Parliamentary win (new seat) | Irish Parliamentary win (new seat) |
1886 general election: West Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | John Deasy | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 8,009 | | |
| | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold |

### Elections in the 1890s

1892 general election: West Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish National Federation | John Deasy | 3,456 | 85.0 | N/A |
| | Ind. Nationalist | John O'Connor Power | 611 | 15.0 | New |
| Majority | Majority | Majority | 2,845 | 70.0 | N/A |
| Turnout | Turnout | Turnout | 4,067 | 38.2 | N/A |
| Registered electors | Registered electors | Registered electors | 10,644 | | |
| | Irish National Federation gain from Irish Parliamentary | Irish National Federation gain from Irish Parliamentary | Swing | N/A | |
Deasy resigns, causing a by-election.
By-election, 1893: West Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish National Federation | Robert Ambrose | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 11,262 | | |
| | Irish National Federation hold | Irish National Federation hold | Irish National Federation hold | Irish National Federation hold | Irish National Federation hold |
1895 general election: West Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish National Federation | Robert Ambrose | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 10,900 | | |
| | Irish National Federation hold | Irish National Federation hold | Irish National Federation hold | Irish National Federation hold | Irish National Federation hold |

### Elections in the 1900s

1900 general election: West Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | Robert Ambrose | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 9,436 | | |
| | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold |
1906 general election: West Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | Robert Ambrose | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 8,941 | | |
| | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold |

### Elections in the 1910s

January 1910 general election: West Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | William Doris | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 9,436 | | |
| | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold |
December 1910 general election: West Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | William Doris | 3,931 | 78.4 | N/A |
| | All-for-Ireland | William O'Brien | 1,082 | 21.6 | N/A |
| Majority | Majority | Majority | 2,849 | 56.8 | N/A |
| Turnout | Turnout | Turnout | 5,013 | 60.7 | N/A |
| Registered electors | Registered electors | Registered electors | 8,261 | | |
| | Irish Parliamentary hold | Irish Parliamentary hold | Swing | N/A | |
1918 general election: West Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Sinn Féin | Joseph MacBride | 10,195 | 86.7 | New |
| | Irish Parliamentary | William Doris | 1,568 | 13.3 | −65.1 |
| Majority | Majority | Majority | 8,627 | 73.4 | N/A |
| Turnout | Turnout | Turnout | 11,763 | 54.3 | −6.4 |
| Registered electors | Registered electors | Registered electors | 21,667 | | |
| | Sinn Féin gain from Irish Parliamentary | Sinn Féin gain from Irish Parliamentary | Swing | N/A | |
The 65.1% drop in the Irish Parliamentary Party vote is the largest decrease in a party's vote between successive House of Commons elections in a single constituency. Between elections, the First World War and Easter Rising had changed the political landscape, and the Representation of the People Act 1918 had greatly increased the electorate.