Maryborough was a constituency represented in the Irish House of Commons until 1800. The town has been known as Portlaoise since 1929.

Members of Parliament 1585 Robert Gale, Thomas Lambyne and George Harvey 1613–1615 Sir Adam Loftus and Alexander Barrington 1634–1635 Sir Walter Crosbie, 1st Baronet and Sir William Gilbert 1639–1649 Sir Nicholas White (died and replaced 1644 by Henry Gilbert) and Sir William Gilbert 1661–1666 John Gilbert and George St George (sat for Leitrim and replaced 1661 by Alexander Pigott)

1689–1801 ElectionFirst MPSecond MP 1689 Pierce Bryan Thady FitzPatrick 1692 St Leger Gilbert Periam Pole 1695 John Weaver 1703 Robert Pigott November 1713 Gerald Bourke Edward Dodsworth 1713 Robert Pigott William Wall 1730 Warner Westenra 1755 John Pigott 1755 Bartholomew William Gilbert May 1761 William Gilbert Eyre Coote 1761 John Parnellfrom 1766 Sir John Parnell, 1st Bt 1764 Hunt Walsh 1776 Robert Jocelyn, Viscount Jocelyn 1778 John Tydd 1782 Hon. Richard FitzPatrick October 1783 Sir John Parnell, 2nd Bt Charles Henry Coote 1783 Sir Arthur Brooke, 1st Bt 1785 Frederick Trench 1790 Samuel Hayes 1796 Hon. John Vesey 1798 Eyre Coote Henry Parnell 1800 Edward Dunne 1801 Constituency disenfranchised

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