Total Number of MPs, Peers and Staff

This data is included in the following tables:

• Table 1: Number of MPs after each general election since 1900
• Table 2: Number of MPs and House of Commons staff at the year end of each financial year since 1997
• Table 3: Composition of the House of Lords at the year end of each financial year since 1997
• Table 4: Historic totals of total number of House of Lords members since 1900
• Table 5: Number of registered Peers’ staff since 1997and the Number of House of Lords staff since 2014

Further information on the number of MPs

The number of Members of the House of Commons is determined by Boundary Reviews conducted by the Boundary Commissions for England, Northern Ireland, Scotland and Wales. To find out more about boundary reviews, see the Commons Library briefing Constituency boundary reviews and the number of MPs.

The 2018 Boundary Review for England and Wales published their initial proposals this year. The House of Commons Library has published briefing papers on both these proposals:

• 2018 Boundary Review: initial proposals for England
• 2018 Boundary Review: initial proposals for Wales

For a breakdown of the party composition of the House of Commons, see the parliamentary page on the current state of the parties.

Further information on the number of Lords

The number of Members of the House of Lords has been subject to reform. The Library’s latest briefing on House of Lords Reform is The House of Lords Reform Act. Further reading can be found in this note.

The House of Lords Library has also published relevant material:

• History of the House of Lords: A Short Introduction
• Size of the House of Lords

For a breakdown of the current composition of the House of Lords, including by party, see the page on Lords by party, type of peerage and gender.

Parliament: facts and figures

• Browse all briefings in the series

This series of publications contains data on various subjects relating to Parliament and Government. Topics include legislation, MPs, select committees, debates, divisions and Parliamentary procedure.

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