Before the Act of Union 1707, the barons of the shire of Cromarty elected commissioners to represent them in the unicameral Parliament of Scotland and in the Convention of Estates. After 1708, Cromartyshire and Nairnshire alternated in returning one member to the House of Commons of Great Britain and later to the House of Commons of the United Kingdom.
List of shire commissioners 1600: John Urquhart of Craigfintray 1617–1633: Sir Thomas Urquhart of Cromarty 1639–41, 1643–44, 1644–47, 1648–51: no representation During the Commonwealth of England, Scotland and Ireland, the sheriffdoms of Sutherland, Ross and Cromarty were jointly represented by one Member of Parliament in the Protectorate Parliament at Westminster. After the Restoration, the Parliament of Scotland was again summoned to meet in Edinburgh. 1661–1663: no representation 1665 convention, 1667 convention, 1669–1674, 1678 convention, 1681–82, 1685–1686: George Dallas of St Martins 1693–1702, 1702–1707: Sir Kenneth Mackenzie of Cromarty and GrandvaleG. E. C., The Complete Baronetage, volume II (1902) p. 356. 1693: John Urquhart of Craighouse (expelled, 1700) 1700–1701: Roderick Mackenzie of Prestonhall 1703–1707: Aeneas McLeod of Cadboll
References Margaret D. Young, The Parliaments of Scotland: Burgh and Shire Commissioners, volume 2 (Edinburgh, 1993) p. 791.
See also List of constituencies in the Parliament of Scotland at the time of the Union