The Scottish Parliament and the Senedd are both holding elections in May 2026, and the Northern Ireland Assembly will be holding an election before May 2027. All of these elections will take place on different boundaries to their current constituencies and, in the case of the Senedd, under a new voting system.

As the boundaries don’t take effect until the election itself, but people may wish to use those boundaries before the elections, we have now added the future boundaries to MapIt, our point and postcode lookup tool and API, under different area type codes. This means you can use MapIt to look up both current and future boundaries for a particular location or postcode, depending on whether you are interested in the constituencies as they are now, or as they will be after the next election.

After the election, the boundaries will move to their normal area type code, as they will then be the actual boundaries, and the previous boundaries will always still be available by using our generation query parameters to access boundaries from previous generations.

Here are some summary maps showing the Welsh Parliament constituencies as they are now and will be next year:

MapIt is used by our own services, such as WriteToThem and FixMyStreet, and is used by many different organisations to help them look up councils or constituencies – perhaps it can help you too!

Please do credit/link to us somewhere if you use this data, to help spread the word of the service we provide 🙂