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Data and resources

2023 Review – electorate data and maps

Legislation provides that the 2023 Review will utilise the Parliamentary electorate as it was at 2 March 2020. The Office for National Statistics published that data on 5 January 2021, following which the four Parliamentary Boundary Commissions for the UK agreed and published the following consequential figures for the 2023 Review: the distribution of constituencies to the four parts of the UK (and within England, to the nine English regions); the electoral quota figure; and the minimum and maximum electorate figure permitted for any non-‘protected’ constituency that a Commission may propose or recommend. You can see these figures on our main 2023 Review page.

Legislation also provides that the Commission may have regard during a Review to the local government and existing constituency boundaries. The local government boundaries that a Commission may have regard to during the 2023 Review must be those in force – or, where relevant, in ‘prospect’ – on 1 December 2020. Current local government boundaries (as well as the boundaries of existing constituencies) can be found on the Ordnance Survey’s election maps website, or by downloading its free Boundary Line product.

‘Prospective’ local government boundaries are those where an Order has – by the specified date – been made for new boundaries, but they have not yet been implemented (generally at the next election held for that local authority). In England, 31 authorities have such ‘prospective’ boundaries at the operative date:

  • Barnet
  • Basingstoke and Deane
  • Brent
  • Buckinghamshire
  • Cambridge
  • Camden
  • Chorley
  • Cornwall
  • Ealing
  • Enfield
  • Halton
  • Hammersmith and Fulham
  • Haringey
  • Harrow
  • Hartlepool
  • Hillingdon
  • Hounslow
  • Isle of Wight
  • Islington
  • Lewisham
  • Merton
  • North Northamptonshire
  • Oxford
  • Pendle
  • Richmond upon Thames
  • Rotherham
  • Salford
  • Sutton
  • West Northamptonshire
  • Westminster
  • Wiltshire

BCE has worked with the relevant local Electoral Registration Officers to recast Parliamentary electorate data for those areas according to those prospective wards: you can download the comprehensive ward and polling district electorates for the 2023 Review in an Excel file here. There are a small number of local authorities for whom we are unable to provide polling district data:

  • Barnet
  • Brent
  • Cambridge
  • Camden
  • Central Bedfordshire
  • Cornwall
  • Ealing
  • Enfield
  • Hammersmith and Fulham
  • Haringey
  • Harrow
  • Hillingdon
  • Hounslow
  • Islington
  • Lewisham
  • Merton
  • Richmond upon Thames
  • Sutton
  • Westminster
  • Wiltshire

We also have the ward data available for download in the following geodata file formats:

Current constituencies and electorate changes

There are currently 533 constituencies in England. 529 were last established in 2007, adopting the recommendations of the Commission’s Fifth General Review. In addition to the Ordnance Survey online mapping of existing constituencies referred to above, PDF maps of current constituencies can be viewed in Volume 3 (London Borough and metropolitan county areas) and Volume 4 (non-metropolitan and unitary authority areas) of the report of our Fifth General Review. The narrative of that Review can be found in Volume 1 of the Report and associated Appendices in Volume 2.

The following four constituencies were subsequently amended in 2009, following an interim review by the Commission: 1) Daventry; 2) South Northamptonshire; 3) Somerton and Frome; and 4) Wells. PDF maps of those four constituencies can again be viewed in our final report of that interim review.

The following spreadsheet details the changing electorate size within the constituencies of England since they were first implemented in the 2010 general election (you can view the data broken down by constituencies or by local authority and region): England Parliamentary electorates 2010 to March 2020.

Electoral Registers

The Commission is supplied with a copy of the full register of electors by each Electoral Registration Officer in England. These are used to ascertain the number of electors in particular geographic areas, which is required to undertake our statutory duty of reviewing constituency boundaries. The full register contains the name and address of all registered electors, and date of birth for some (16 and 17 year-olds who are due to reach the age of 18 during the life of the register). The full register also contains information as to whether an individual has chosen to opt out of having their details included on the “edited” version of the register (which is available for sale by the local authority). Applications to view – or obtain information from – an electoral register should be made directly to the local Electoral Registration Officer for the area concerned.

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