Cell towers in Grigny (Essonne)

2 supports are declared underground, in a gallery or a tunnel. For questions about exposure, see the exposure guide.

Most of the town's 21 masts are buildings (12); 2 bridges or viaducts and 2 underground or tunnel sites make up the rest of the mix.

Masts stand at Tunnels SNCF de Grigny, L'Orme Pomponne, Avenue de la Première Armée Rhin et Danube, Les Blancs Manteaux, Rue Ferdinand de Lesseps and 10 Rue des Carriers Italiens.

Over the past 12 months ANFR recorded 9 new systems here. ANFR has approved one new site that is not live yet, plus additions on 4 existing masts. New: Orange (4G and 5G, including 5G at 3.5 GHz) at 5 Rue de l'Avenir. 12 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

ANFR lists a 40 m building at 18 Avenue des Sablons as the tallest structure. The median is 19 m, slightly below the Essonne median of 26 m.

Systems from 2000 are still on the register. Bouygues Telecom switched on the first 5G here in November 2020; Free Mobile followed in December 2020, SFR followed in December 2020. 2015 was the busiest year, with 31 new systems, most of them 4G.

On 3.5 GHz, the fastest 5G band: Bouygues Telecom on 6 of its 9 masts, Free Mobile on 6 of its 12 masts, SFR on all 4 masts and Orange on 2 of its 3 masts.

Nearby, Ris-Orangis (1.6 km to the east) has a camouflaged "tree" pylon among its supports.

Among the 60 Essonne towns with at least five masts, Grigny ranks 9th by mast count. With 21 masts for 26,842 residents, or 8 per 10,000, it has more masts per inhabitant than the median for those towns (7).

At 5 km² with 26,842 residents, the commune is dense enough that most antennas sit on rooftops rather than pylons. It is part of the CA Grand Paris Sud Seine Essonne Sénart intercommunal grouping.

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