Parliamentary constituencies
The United Kingdom is currently divided into 650 parliamentary constituencies. One Member of Parliament (MP) in the House of Commons represents a single constituency.
Constituencies in the UK
There are currently:
- 533 constituencies in England
- 59 in Scotland
- 40 in Wales
- 18 in Northern Ireland.
Size of constituencies by electorate
The number of people that are registered to vote (the electorate) differs by constituency. The Office for National Statistics gives the average electorate across constituencies of about:
- 73,000 in England
- 68,300 in Scotland
- 57,700 in Wales
- 74,100 in Northern Ireland
Largest and smallest constituencies by area
The largest constituency is Ross, Skye and Lochaber. It measures approximately 12,000 square kilometres.
The smallest constituency is Islington North at 7.35 square kilometres.
Constituency boundaries
Boundary commissions review boundaries. There are four commissions:
- Boundary Commission for England
- Boundary Commission for Scotland
- Boundary Commission for Wales
- Boundary Commission for Northern Ireland
Commissions recommend changes to boundaries about every 5 years. Changes may be due to changes in population or local government boundaries.
Both Houses of Parliament need to agree any changes.
About your constituency
The House of Commons Library has data to help you understand more about your constituency.