Cell towers in Orsay (Essonne)

Most of the town's 12 masts are pylons (5); 1 water tower and 1 church or religious building make up the rest of the mix.

Antennas are listed at Les Hucheries, 15 rue Georges Clemenceau, Bois Persan, boulevard de la Terrasse, chemin du Petit Saclay and 67 rue de Montlhéry.

ANFR has approved one new site that is not live yet, plus additions on 5 existing masts. New: Free Mobile (3G, 4G and 5G, including 5G at 3.5 GHz) at Boulevard Friedel. 7 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

2 masts belong to the commune itself and 3 to Hivory; the rest sit mainly on private buildings.

Systems from 1996 are still on the register. Local 5G started with Orange in March 2021; Bouygues Telecom followed in April 2021, Free Mobile followed in August 2021. 2015 was the busiest year, with 21 new systems, most of them 4G.

The tallest structure is a 48 m water tower at Le Guichet. The median is 23 m, slightly below the Essonne median of 26 m.

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

Nearby, Villejust (3.9 km to the east) has 18 masts, more than here.

Only one mast carries all four networks; 3 supports carry only Orange.

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