It is the largest, by area, of the so-called petite couronne (inner ring) suburbs of Paris.

The inhabited area of Tremblay-en-France, however, is served by Vert-Galant station on Paris RER line .

Air France's head office is located in the Roissypôle complex,[4][5] on the grounds of Charles de Gaulle Airport and in Tremblay-en-France.

[9] ASL Airlines France has its head office in the Bâtiment Le Séquoia in the commune.

[15][16] The École Pierre-Brossolette had been targeted for closure, prompting protests from students asking the commune to not have the school closed.