UK Parliamentary Constituency Map
Find which Westminster parliamentary constituency any UK postcode falls in, or browse all 650 on the map. These are the current boundaries used at general elections, from the ONS Open Geography Portal.
Constituencies don't follow council boundaries
A parliamentary constituency is built from electoral wards, but it doesn't have to stop where a council does. Worthing West, South Basildon and East Thurrock, and Arundel and Littlehampton each cross a local authority line, which is why this map is separate from our counties and councils map rather than nested inside it.
Boundaries are redrawn roughly every ten years by the four Boundary Commissions, to keep the number of electors in each seat broadly even as populations shift. The current set came into effect at the 2024 general election.
Frequently Asked Questions
What constituency am I in?
Enter your postcode above. You'll get your constituency name, and you can click through to see its boundary on the map.
How many constituencies are there in the UK?
650. England has 543, Scotland 57, Wales 32 and Northern Ireland 18.
What's the difference between a constituency and a council ward?
A ward elects local councillors; a constituency elects an MP. Constituencies are built from wards, but a constituency usually contains many wards and can span more than one council.
Who draws the boundaries?
The Boundary Commissions for England, Scotland, Wales and Northern Ireland, independently of government, roughly every ten years.
Can I download the map?
Yes. A printable PDF, plus the boundaries as GeoJSON or KML. All free.
Related Guides & Tools
More boundary and postcode tools on MapTools.uk:
- UK Counties and Councils - councils, ceremonial counties and wards for the whole UK
- Postcode Areas - the drill-down map for Royal Mail postcode areas, districts and sectors
- Postcode Mapper - plot your own list of postcodes on a map
Data and licensing
Boundaries: ONS Open Geography Portal (Westminster Parliamentary Constituencies).
Postcode data: ONS Postcode Directory (ONSPD), May 2026 edition.
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics, licensed under the Open Government Licence v3.0.
These are official published boundaries - not derived from postcode locations.