He was appointed High Sheriff of Donegal in 1818 and High Sheriff of Tyrone in 1825 and then elected as the Member of Parliament (MP) for Londonderry City at the 1830 general election,[6] but his election was declared void.[6] A member of the United University club, he was re-elected at the resulting by-election[6] held on 2 April 1831, and held the seat until his death in 1860, at the age of 63,[6] when the baronetcy became extinct.[2] In 1859 he voted in favour of the Derby ministry's reform bill.
There is a statue of Ferguson in Brooke Park in his native Derry.[7]
^ abc"Baronets: F, part 1". Leigh Rayment's baronetage pages. Archived from the original on 1 May 2008. Retrieved 21 July 2010.{{cite web}}: CS1 maint: unfit URL (link)
^ Arthur Sleigh, The Royal Militia and Yeomanry Cavalry Army List, April 1850, London: British Army Despatch Press, 1850/Uckfield: Naval and Military Press, 1991, ISBN 978-1-84342-410-9, p. 132.
^Lt-Col H.G. Hart, The New Annual Army List, and Militia List (various dates from 1840).
^Morton, William W., ed. (2001). St. Columb's Cathedral Londonderry Millennium Historical Guide. A. S. Bell Publishing. pp. 41–42.