Mayo (UK Parliament constituency)

County Mayo was a parliamentary constituency in Ireland, which returned two Members of Parliament (MPs) to the House of Commons of the Parliament of the United Kingdom from 1801 to 1885.

History
The constituency was created in 1801 under the Acts of Union 1800, succeeding the earlier County Mayo constituency in the pre-union Parliament of Ireland. Under the Redistribution of Seats Act 1885 it was divided into four new single-seat constituencies: East Mayo, North Mayo, South Mayo and West Mayo.

Boundaries
This constituency comprised the whole of County Mayo.

Elections
The elections in this constituency took place using the first past the post electoral system.

Elections in the 1830s
Browne was elevated to the peerage, becoming 1st Baron Oranmore and causing a by-election.


 * Note (1836): Walker suggests 609 votes were placed for Robert Browne, and none for John Browne, but Stooks Smith's figures have been used above.

Elections in the 1840s
Brabazon's death caused a by-election.

Blake resigned by accepting the office of Steward of the Chiltern Hundreds, causing a by-election.

Elections in the 1850s
Browne's death caused a by-election.

On petition, Moore was unseated, causing a by-election.

Elections in the 1870s
Moore's death caused a by-election.

On petition, Browne and Tighe were unseated.

Elections in the 1880s
Parnell was also elected MP for Cork City and opted to sit there, causing a by-election.