| Large Regional Map (175k) | Region composition | Area definitions |
In addition to the 20 regions, we also divide the country into eleven areas. Each area is made up of one or two complete Electoral Calculus regions in the following way.
| Area | Regions | Counties (historic) |
| Scotland | East Scotland West Scotland | All Scotland |
| The North | North | Cumbria, Northumberland, Newcastle area, Durham, Teeside |
| North West | Lancashire Greater Manchester | Lancashire, Merseyside Manchester boroughs |
| Yorks/Humber | Yorkshire Humberside | North Yorkshire, West Yorkshire South Yorkshire, Humber area, Lincolnshire |
| Wales | Wales | All Wales |
| West Midlands | Severn West Midlands | Cheshire, Shropshire, Staffordshire, Hereford & Worcestershire Birmingham, Black Country, Coventry and Solihull |
| East Midlands | East Midlands | Derbyshire, Nottinghamshire, Leicestershire, Warwickshire |
| Anglia | East Anglia Essex | Northamptonshire, Bedfordshire, Cambridgeshire, Norfolk, Suffolk
Buckinghamshire, Essex, Hertfordshire |
| South West | South West West | Cornwall, Devon, Somerset, Dorset Bristol area, Gloucestershire, Wiltshire, Oxfordshire |
| London | North London South London | All London Boroughs |
| South East | South South East | Berkshire, Hampshire, Surrey West Sussex, East Sussex, Kent |
These are similar, but not identical, to current adminstrative regional definitions.