Portarlington (UK Parliament constituency)

Portarlington
Former Borough constituency for the House of Commons
1801–1885
Number of members	One
Replaced by	King's County Tullamore and Queen's County Leix

Portarlington was a rotten borough and is a former United Kingdom Parliament constituency, in Ireland, returning one MP. It was an original constituency represented in Parliament when the Union of Great Britain and Ireland took effect on 1 January 1801.

This constituency was the Parliamentary borough of Portarlington in Queen's County now called County Laois.

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