# East Mayo (UK Parliament constituency)

East 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 from 1885 to 1922.
Prior to the 1885 general election the area was part of the 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 eastern part of County Mayo.
1885–1922: That part of the barony of Costello not contained within the constituency of South Mayo and that part of the barony of Gallen not contained within the constituency of North Mayo.

## Members of Parliament

| Years | Member | Party |
| 1885–1890 | John Dillon | Irish Parliamentary Party |
| 1891–1900 | John Dillon | Irish National Federation |
| 1900–1918 | John Dillon | Irish Parliamentary Party |
| 1918–1922 | Éamon de Valera | Sinn Féin |

## Elections
### Elections in the 1880s

General election 27 November 1885: East Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | John Dillon | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 8,149 | | |
| | 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) |
General election 6 July 1886: East Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | John Dillon | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 8,149 | | |
| | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold |

### Elections in the 1890s

General election 13 July 1892: East Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish National Federation | John Dillon | 2,464 | 90.6 | N/A |
| | Irish National League | John Fitzgibbon | 257 | 9.4 | N/A |
| Majority | Majority | Majority | 2,207 | 81.2 | N/A |
| Turnout | Turnout | Turnout | 2,721 | 42.6 | N/A |
| Registered electors | Registered electors | Registered electors | 6,387 | | |
| | Irish National Federation gain from Irish Parliamentary | Irish National Federation gain from Irish Parliamentary | Swing | N/A | |
General election 19 July 1895: East Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish National Federation | John Dillon | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 7,966 | | |
| | Irish National Federation hold | Irish National Federation hold | Irish National Federation hold | Irish National Federation hold | Irish National Federation hold |

### Elections in the 1900s

General election 3 October 1900: East Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | John Dillon | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 8,225 | | |
| | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold |
General election 19 January 1906: East Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | John Dillon | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 8,029 | | |
| | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold |

### Elections in the 1910s

General election 18 January 1910: East Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | John Dillon | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 7,816 | | |
| | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold |
General election 6 December 1910: East Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Irish Parliamentary | John Dillon | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 7,816 | | |
| | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold | Irish Parliamentary hold |
General Election 14 December 1918: East Mayo :
| Party | Party | Candidate | Votes | % | ±% |
| | Sinn Féin | Éamon de Valera | 8,975 | 66.5 | New |
| | Irish Parliamentary | John Dillon | 4,514 | 33.5 | N/A |
| Majority | Majority | Majority | 4,461 | 33.0 | N/A |
| Turnout | Turnout | Turnout | 13,489 | 62.3 | N/A |
| Registered electors | Registered electors | Registered electors | 21,635 | | |
| | Sinn Féin gain from Irish Parliamentary | Sinn Féin gain from Irish Parliamentary | Swing | N/A | |