Like the other 576 French constituencies, it elects one MP using the two-round system, with a run-off if no candidate receives over 50% of the vote in the first round.

The 4th Constituency of the Manche largely consists of the city of Cherbourg and the most northerly parts of the Cotentin Peninsula.

[2] Prior to the boundary changes the seat was reliably conservative, however subsequent elections have resulted in both PS and Independent gains.

[3] Despite being elected as an independent and defeating the official En Marche!

candidate Sonia Krimi subsequently joined their parliamentary group.