State of the parties as of March 2017
|Party or group||Seats|
|Social Democratic and Labour Party||2|
|Government working majority||87|
- Sinn Féin contests UK general elections but does not take the seats; therefore, its MPs do not vote or speak in the House of Commons.
- Does not vote except to break a tie; the Speaker is not a member of any party.
- Seats awaiting the election of a new MP in a by-election or general election.
- Does not include the Speaker and Speaker's Deputies (who do not usually vote) or Sinn Féin (which does not take the seats).