St Johnstown (County Longford) (Parliament of Ireland constituency)
St Johnstown was a borough constituency for Ballinalee or Saintjohnstown County Longford represented in the Irish House of Commons until 1800.
Members of Parliament
| Election | First member | First party | Second member | Second party | ||
| 1634 | John Ware | Edmund Beagan | ||||
| 1639 | John Ware | Dudley Loftus | ||||
| 1661 | John Edgeworth | Sir Henry Piers, 1st Baronet | ||||
| 1689 Patriot Parliament | Sir William Ellis | Lt.-Col. James Nugent | ||||
| 1692 | Sir John Edgeworth | Alexander Fraser | ||||
| 1695 | Sir John Edgeworth | John Aghmooty | ||||
| 1703 | Ambrose Edgeworth | John Aghmooty | ||||
| 1711 | Anthony Atkinson | John Aghmooty | ||||
| 1713 | John Kennedy | Robert Edgeworth | ||||
| 1715 | Henry Edgeworth | Robert Edgeworth | ||||
| 1721 | Henry Edgeworth | Robert Edgeworth | ||||
| 1727 | Henry Edgeworth | Thomas Newcomen | ||||
| 1751 | Hon. John Forbes | Thomas Newcomen | ||||
| 1761 | George Forbes, Viscount Forbes | Charles Newcomen | ||||
| 1762 | George Forbes | Charles Newcomen | ||||
| 1768 | Ralph Fetherston | Charles Newcomen | ||||
| 1773 | Ralph Fetherston | Robert Jephson | ||||
| 1776 | Ralph Fetherston | Hon. John Vaughan | ||||
| 1780 | Sackville Hamilton | Hon. John Vaughan | ||||
| 1783 | Sir Thomas Fetherston, 2nd Bt | Nicholas Colthurst | ||||
| 1790 | George Cavendish | John Taylor | ||||
| January 1798 | Sir William Gleadowe-Newcomen, 1st Bt | Francis Hardy | ||||
| 1798 | Richard Lovell Edgeworth | William Moore | ||||
| 1801 | Constituency disenfranchised | Constituency disenfranchised | Constituency disenfranchised | Constituency disenfranchised | Constituency disenfranchised |