The traditional main parties of the centre-right (LR) and of the centre-left (PS) suffered a significant decline, while the newly created party of the new President Emmanuel Macron topped the poll in the first round.

Outgoing MP Gilles Carrez (LR), who was aiming for a sixth consecutive term, for once failed to finish first, but was qualified for the second round.

In Le Perreux, Gilles Carrez (the town's former mayor) was first (38.48%), Nadine Ret second (34.16%), and France insoumise candidate Raphaëlle Martinez third (8.69%).

In Champigny-sur-Marne, Dominique Adenot, the town's Communist mayor, finished first in the first round, with 30,93% - followed by Caroline Adomo (27.33%) and Gilles Carrez (22.81%).

The addition of Nogent to the constituency contributed to weakening the radical left.