Cell towers in Marcoussis (Essonne)

The widest declared gap between neighbouring supports is about 2.1 km, to the south-west of the centre. Most declared azimuths point outward, along a corridor or valley rather than at the centre. 1 support is declared underground, in a gallery or a tunnel. For questions about exposure, see the exposure guide.

1 underground or tunnel site and 3 pylons and 1 building carry the commune's antennas.

Antennas are listed at Bois des Mocquets, 3/5 avenue Jean de Montaigu, Le Grand Etang, 14 RTE de la Folie Bessin and Le Bois des Carres.

The declared supports are a 50 m pylon, at Bois des Mocquets, for Bouygues Telecom, Free Mobile, Orange and SFR; a 13 m building, at 3/5 avenue Jean de Montaigu, for Orange; a 38 m pylon, at Le Grand Etang, for Bouygues Telecom and Free Mobile; a 37 m pylon, at 14 RTE de la Folie Bessin, for Bouygues Telecom; a 13 m underground or tunnel site, at Le Bois des Carres, for Bouygues Telecom and SFR.

The tallest structure is a 50 m pylon at Bois des Mocquets. The median is 37 m, above the Essonne median of 26 m.

ANFR has approved one new site that is not live yet, plus additions on one existing mast. New: SFR (3G, 4G and 5G, including 5G at 3.5 GHz) at 1 Rue Joly de Bammevile. 5 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

Systems from 1997 are still on the register. Local 5G started with Bouygues Telecom in November 2020; Free Mobile followed in December 2020, Orange followed in September 2021. 2015 was the busiest year, with 10 new systems, most of them 4G.

Among the 60 Essonne towns with at least five masts, Marcoussis ranks 60th by mast count. With 5 masts for 8,618 residents, or 6 per 10,000, it has fewer masts per inhabitant than the median for those towns (7).

2 masts belong to Cellnex and 1 to TDF.

On 3.5 GHz, the fastest 5G band: Bouygues Telecom on 2 of its 4 masts, Orange on all 2 masts, Free Mobile on 1 of its 2 masts and SFR on 1 of its 2 masts.

Nearby, Nozay (2.1 km to the north) has a higher 5G share (100%).

Only one mast carries all four networks.

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