2 min read - Last reviewed 3 Jul 2026
What is a constituency?
A constituency is the local area that elects one MP to the House of Commons.
What it means
A constituency is a geographic area that elects one MP to the House of Commons.
Why it matters
Constituencies make postcode lookup possible. They connect a local place to a current MP and then to public parliamentary records.
Example
Two nearby postcodes can sit in different constituencies, so Plain Politics should use a lookup source instead of guessing from a town name.