It returned one Member of Parliament (MP) to the British House of Commons from 1885 until it was abolished in 1922.
Prior to the 1885 United Kingdom general election and after the dissolution of Parliament in 1922 the area was part of the Londonderry constituency.
Had the Sinn Féin candidate won, then instead of taking up the Westminster seat he would have participated in the revolutionary First Dáil.
The elections in this constituency took place using the first past the post electoral system.
Henry is appointed Lord Chief Justice of Northern Ireland, prompting a by-election.