Click on a nation or region below to see the current and proposed constituency boundaries and the underlying wards in each region. Please note that the full boundary data has been simplified for online use and may not correspond to the precise position of the actual boundaries at the smallest scales.
The maps below show the proposed constituencies in Scotland, Wales, and Northern Ireland, and in each region in England.
- Northern Ireland
- North East
- North West
- Yorkshire and the Humber
- East Midlands
- West Midlands
- East of England
- South East
- South West
How it works
Each map shows boundaries for three sets of areas: the current Parliamentary constituencies (pink), the proposed Parliamentary constituencies (blue), and the electoral wards in 2015 (black). Each of these boundaries can be toggled on and off using the checkboxes at the bottom right of the map.
The Area Information box shows information about areas in the topmost layer shown on the map: their name, code, and Parliamentary electorate in December 2015 is shown when the mouse highlights an area by hovering over it. Press and hold on an area to get the same information on a touchscreen device. By default, the wards are the topmost layer, but any layer can be brought to the top by toggling it.
Ward areas are special in that a set of wards can be selected by clicking on them, and the sum of the electorates in the selected wards is shown in the Electorate box at the top right of the map. This allows you to explore the impact of adding or removing certain wards from current or proposed constituencies. The data for the selected wards can then be downloaded by clicking Get Data. Note that on these maps the wards are shown whole and in some cases constituency boundaries cross wards.
Further information on the boundary review process can be found in the followings House of Commons Library briefings:
- Constituency boundary reviews and the number of MPs
- Parliamentary boundary reviews: public consultations
- 2018 Review of Parliamentary constituencies: Northern Ireland
- 2018 Review of Parliamentary constituencies: Wales
- 2018 Boundary Review: initial proposals for England
Data on the boundaries of constituencies and wards contain Ordnance Survey data © Crown copyright and database right 2016. Boundary data for Great Britain is available from the Office for National Statistics Open Geography Portal. Boundary data for Northern Ireland is available from Open Data Northern Ireland. Data is licensed under the Open Government Licence v.3.0.
Developed by Oliver Hawkins for the House of Commons Library.