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.

Elections in the 1890s
Deasy resigns, causing a by-election.

Elections in the 1910s
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.