Cell towers in Franconville (Val-d'Oise)

Masts stand at Le Sud de la Mare des Noués, 395 Rue du Général Leclerc, Les Rinvals, rue Albert Camus, rue du Plessis Bouchard and 38 Rue de la Mare des Noues.

ANFR has approved one new site that is not live yet, plus additions on 4 existing masts. New: Free Mobile (4G and 5G, including 5G at 3.5 GHz) at 4 Rue de la Bonne Rencontre. 9 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

Systems from 1999 are still on the register. Bouygues Telecom opened 5G here in November 2020; Free Mobile followed in December 2020, SFR followed in December 2020. 2014 was the busiest year, with 22 new systems, most of them 4G.

Most antennas sit on rooftops (16 of 17), so heights stay modest; the tallest support is 47 m at 1 Allée du Lavoir.

On 3.5 GHz, the fastest 5G band: Bouygues Telecom on 4 of its 5 masts, Free Mobile on 4 of its 6 masts, Orange on 3 of its 4 masts and SFR on 2 of its 4 masts.

Nearby, Ermont (2 km to the east) has a higher 5G share (94%).

At 6 km² with 37,754 residents, the commune is dense enough that most antennas sit on rooftops rather than pylons. It is part of the CA Val Parisis intercommunal grouping.

Most of the town's 17 masts are buildings (16).

Figures above cover installations declared to ANFR as in service or technically operational, as of October 2026; approved projects are not counted.