| Large Area Map (380k) | Area definitions | Region composition |
There are twenty regions. They are listed below, along with their constituent unofficial "Historic Counties", plus official district, borough or unitary local authorities. The Historic Counties are shown to help interpretation and are similar, but not identical, to the official Preserved County names. The Historic Counties derive from the 1974 reorginisation and include Cleveland (renamed "Teesside"), Humberside (renamed "Humber area"), Tyne and Wear (renamed "Newcastle area") and Avon (renamed "Bristol area"), with additional modifications for clarity, such as dividing up Greater Manchester and the West Midlands. Note that "South London" contains three boroughs which are north of the Thames in order to keep the two halves of London roughly equal size.
| Historic County | District, Borough or Unitary Council |
|---|---|
| 1. East Scotland | |
| Borders | Scottish Borders |
| Central | Clackmannanshire, Falkirk, Stirling |
| Edinburgh area | East Lothian, Edinburgh, Midlothian, West Lothian |
| Fife | Fife |
| Grampian | Aberdeen, Aberdeenshire, Moray |
| Highland | Highland |
| Orkney and Shetland | Orkney Islands, Shetland Islands |
| Tayside | Angus, Dundee, Perth and Kinross |
| Western Isles | Na h-Eileanan an lar |
| 2. West Scotland | |
| Argyll and Bute | Argyll and Bute |
| Ayrshire and Lanark | East Ayrshire, North Ayrshire, South Ayrshire, South Lanarkshire |
| Dumfries and Galloway | Dumfries and Galloway |
| Glasgow area | East Dunbartonshire, East Renfrewshire, Glasgow, Inverclyde, North Lanarkshire, Renfrewshire, West Dunbartonshire |
| 3. Northern Ireland | |
| Antrim | Antrim, Ballymena, Ballymoney, Belfast, Carrickfergus, Larne, Lisburn, Moyle, Newtownabbey |
| Armagh | Armagh, Craigavon |
| Down | Ards, Banbridge, Castlereagh, Down, Newry and Mourne, North Down |
| Fermanagh | Fermanagh |
| Londonderry | Coleraine, Derry, Limavady, Magherafelt |
| Tyrone | Cookstown, Dungannon and South Tyrone, Omagh, Strabane |
| 4. North | |
| Cumbria | Allerdale, Barrow-in-Furness, Carlisle, Copeland, Eden, South Lakeland |
| Durham | Darlington, Durham |
| Newcastle area | Gateshead, Newcastle upon Tyne, North Tyneside, South Tyneside, Sunderland |
| Northumberland | Northumberland |
| Teesside | Hartlepool, Middlesbrough, Redcar and Cleveland, Stockton-on-Tees |
| 5. Lancashire | |
| Lancashire | Blackburn with Darwen, Blackpool, Burnley, Chorley, Fylde, Hyndburn, Lancaster, Pendle, Preston, Ribble Valley, Rossendale, South Ribble, West Lancashire, Wyre |
| Merseyside | Knowsley, Liverpool, Sefton, St Helens, Wirral |
| 6. Greater Manchester | |
| Central Manchester | Manchester, Salford, Trafford |
| Eastern Manchester | Oldham, Rochdale, Stockport, Tameside |
| Western Manchester | Bolton, Bury, Wigan |
| 7. Yorkshire | |
| North Yorkshire | Craven, Hambleton, Harrogate, Richmondshire, Ryedale, Scarborough, Selby, York |
| West Yorkshire | Bradford, Calderdale, Kirklees, Leeds, Wakefield |
| 8. Humberside | |
| Humber area | East Riding of Yorkshire, Kingston Upon Hull, North East Lincolnshire, North Lincolnshire |
| Lincolnshire | Boston, East Lindsey, Lincoln, North Kesteven, South Holland, South Kesteven, West Lindsey |
| South Yorkshire | Barnsley, Doncaster, Rotherham, Sheffield |
| 9. West Midlands | |
| Birmingham | Birmingham |
| Black Country | Dudley, Sandwell, Walsall, Wolverhampton |
| Coventry and Solihull | Coventry, Solihull |
| 10. East Midlands | |
| Derbyshire | Amber Valley, Bolsover, Chesterfield, Derby, Derbyshire Dales, Erewash, High Peak, North East Derbyshire, South Derbyshire |
| Leicestershire | Blaby, Charnwood, Harborough, Hinckley and Bosworth, Leicester, Melton, North West Leicestershire, Oadby and Wigston, Rutland |
| Nottinghamshire | Ashfield, Bassetlaw, Broxtowe, Gedling, Mansfield, Newark and Sherwood, Nottingham, Rushcliffe |
| Warwickshire | North Warwickshire, Nuneaton and Bedworth, Rugby, Stratford On Avon, Warwick |
| 11. Severn | |
| Cheshire | Cheshire East, Cheshire West and Chester, Halton, Warrington |
| Hereford and Worcestershire | Bromsgrove, Herefordshire, Malvern Hills, Redditch, Worcester, Wychavon, Wyre Forest |
| Shropshire | Shropshire, Telford and Wrekin |
| Staffordshire | Cannock Chase, East Staffordshire, Lichfield, Newcastle-under-Lyme, South Staffordshire, Stafford, Staffordshire Moorlands, Stoke-on-trent, Tamworth |
| 12. Wales | |
| Clwyd | Conwy, Denbighshire, Flintshire, Wrexham |
| Dyfed | Carmarthenshire, Ceredigion, Pembrokeshire |
| Gwent | Blaenau Gwent, Caerphilly, Monmouthshire, Newport, Torfaen |
| Gwynedd | Gwynedd, Isle of Anglesey |
| Mid Glamorgan | Bridgend, Merthyr Tydfil, Rhondda Cynon Taf |
| Powys | Powys |
| South Glamorgan | Cardiff, Vale of Glamorgan |
| West Glamorgan | Neath Port Talbot, Swansea |
| 13. East Anglia | |
| Bedfordshire | Bedford, Central Bedfordshire, Luton |
| Cambridgeshire | Cambridge, East Cambridgeshire, Fenland, Huntingdonshire, Peterborough, South Cambridgeshire |
| Norfolk | Breckland, Broadland, Great Yarmouth, King's Lynn and West Norfolk, North Norfolk, Norwich, South Norfolk |
| Northamptonshire | Corby, Daventry, East Northamptonshire, Kettering, Northampton, South Northamptonshire, Wellingborough |
| Suffolk | Babergh, East Suffolk, Ipswich, Mid Suffolk, West Suffolk |
| 14. Essex | |
| Buckinghamshire | Aylesbury Vale, Chiltern, Milton Keynes, South Bucks, Wycombe |
| Essex | Basildon, Braintree, Brentwood, Castle Point, Chelmsford, Colchester, Epping Forest, Harlow, Maldon, Rochford, Southend-on-Sea, Tendring, Thurrock, Uttlesford |
| Hertfordshire | Broxbourne, Dacorum, East Hertfordshire, Hertsmere, North Hertfordshire, St Albans, Stevenage, Three Rivers, Watford, Welwyn Hatfield |
| 15. West | |
| Bristol area | Bath and North East Somerset, Bristol, North Somerset, South Gloucestershire |
| Gloucestershire | Cheltenham, Cotswold, Forest of Dean, Gloucester, Stroud, Tewkesbury |
| Oxfordshire | Cherwell, Oxford, South Oxfordshire, Vale of White Horse, West Oxfordshire |
| Wiltshire | Swindon, Wiltshire |
| 16. North London | |
| North London | Barking and Dagenham, Barnet, Brent, Camden, City of London, City of Westminster, Enfield, Hackney, Hammersmith and Fulham, Haringey, Harrow, Havering, Islington, Kensington and Chelsea, Newham, Redbridge, Tower Hamlets, Waltham Forest |
| 17. South London | |
| South London | Bexley, Bromley, Croydon, Ealing, Greenwich, Hillingdon, Hounslow, Kingston upon Thames, Lambeth, Lewisham, Merton, Richmond upon Thames, Southwark, Sutton, Wandsworth |
| 18. South West | |
| Cornwall | Cornwall, Isles of Scilly |
| Devon | East Devon, Exeter, Mid Devon, North Devon, Plymouth, South Hams, Teignbridge, Torbay, Torridge, West Devon |
| Dorset | 'Bournemouth, Christchurch and Poole', Dorset |
| Somerset | Mendip, Sedgemoor, Somerset West and Taunton, South Somerset |
| 19. South | |
| Berkshire | Bracknell Forest, Reading, Slough, West Berkshire, Windsor and Maidenhead, Wokingham |
| Hampshire | Basingstoke and Deane, East Hampshire, Eastleigh, Fareham, Gosport, Hart, Havant, Isle of Wight, New Forest, Portsmouth, Rushmoor, Southampton, Test Valley, Winchester |
| Surrey | Elmbridge, Epsom and Ewell, Guildford, Mole Valley, Reigate and Banstead, Runnymede, Spelthorne, Surrey Heath, Tandridge, Waverley, Woking |
| 20. South East | |
| East Sussex | Brighton and Hove, Eastbourne, Hastings, Lewes, Rother, Wealden |
| Kent | Ashford, Canterbury, Dartford, Dover, Gravesham, Maidstone, Medway, Sevenoaks, Shepway, Swale, Thanet, Tonbridge and Malling, Tunbridge Wells |
| West Sussex | Adur, Arun, Chichester, Crawley, Horsham, Mid Sussex, Worthing |
For reference, the following table describes the links between the Electoral Calculus regions and the official government areas:
| Area | Electoral Calculus equivalent regions | Counties (historic) |
| Scotland | East Scotland West Scotland | All Scotland |
| Northern Ireland | Northern Ireland | All Northern Ireland |
| North East | North (−Cumbria) | Northumberland, Newcastle area, Durham, Teesside |
| North West | Lancashire Manchester (+Cumbria, +Cheshire) | Cumbria, Lancashire, Merseyside, Manchester boroughs, Cheshire |
| Yorks/Humber | Yorkshire Humberside (−Lincolnshire) | North Yorkshire, West Yorkshire, South Yorkshire, Humber area |
| Wales | Wales | All Wales |
| West Midlands | Severn West Midlands (−Cheshire, +Warwickshire) | Shropshire, Staffordshire, Hereford & Worcestershire, Birmingham, Black Country, Coventry and Solihull, Warwickshire |
| East Midlands | East Midlands (−Warwickshire, +Lincolnshire, +Northamptonshire) | Derbyshire, Leicestershire, Lincolnshire, Northamptonshire, Nottinghamshire |
| Anglia | East Anglia Essex (−Buckinghamshire, −Northamptonshire) | Bedfordshire, Cambridgeshire, Norfolk, Suffolk, Essex, Hertfordshire |
| South West | South West West (−Oxfordshire) | Cornwall, Devon, Somerset, Dorset, Bristol area, Gloucestershire, Wiltshire |
| London | North London South London | All London Boroughs |
| South East | South South East (+Buckinghamshire, +Oxfordshire) | Berkshire, Buckinghamshire, Hampshire, Oxfordshire, Surrey, West Sussex, East Sussex, Kent |