Cell towers in Thiais (Val-de-Marne)

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

Declared supports include 7 underground or tunnel sites and 1 camouflaged "tree" pylon, with buildings making up most of the remainder.

Declared locations include Rue des Alouettes, 269 avenue de Fontainebleau, Trou aux Renards Guy Moquet, 53 Rue de la Résistance, Tunnel Trou au Renard and Centre Commercial Régional de Belle Epine.

32 systems were switched on in the past 12 months. ANFR has approved one new site that is not live yet, plus additions on 12 existing masts. New: Free Mobile (4G and 5G, including 5G at 3.5 GHz) at 11/13 Rue Jules Gourie. 15 Bouygues Telecom 5G transmitters are listed as technically operational — installed, but not yet declared commercially in service.

2014 was the busiest year, with 53 new systems, most of them 4G. Local 5G started with Bouygues Telecom in November 2020; SFR followed in December 2020, Free Mobile followed in December 2020. The oldest transmitter still listed here goes back to 1995.

The highest support stands 49 m at 9 rue du Pave Grignon (building). The median height of measured supports is 24 m.

3.5 GHz 5G is declared by Free Mobile on 8 of its 12 masts, Orange on 8 of its 10 masts, SFR on 8 of its 10 masts and Bouygues Telecom on 6 of its 13 masts.

1.7 km to the east, neighbouring Choisy-le-Roi has 36 masts declared.

By mast count, Thiais is 9th of the 44 Val-de-Marne towns that have five or more. With 31 masts for 32,918 residents, or 9 per 10,000, it has more masts per inhabitant than the median for those towns (7).

At 6 km² with 32,918 residents, the commune is dense enough that most antennas sit on rooftops rather than pylons. It is part of the Métropole du Grand Paris intercommunal grouping.

Source: operator declarations to ANFR, as of October 2026. Projects that are only approved are left out of the totals.