Cell towers in Serris (Seine-et-Marne)

Declared locations include 14 Cours du Danube, Les Prés de la Fontaine, 7 Cours du Danube, Val D'Europe, Les Près Annelets and 3 Cours de la Garonne.

8 of the 10 masts are rooftop-mounted. The tallest support is 45 m at Les Près Annelets (pylon). The median is 19 m, slightly below the Seine-et-Marne median of 31 m.

3.5 GHz 5G is declared by Free Mobile on 3 of its 5 masts and Orange on all 3 masts. Bouygues Telecom only has 5G on 2100 MHz — longer reach, lower speed. 60% of the town's masts carry 5G, fewer than across Seine-et-Marne towns with five or more masts (89%).

2021 was the busiest year, with 41 new systems, most of them 4G. Free Mobile switched on the first 5G here in June 2021; Bouygues Telecom followed in August 2021, Orange followed in January 2022. The oldest transmitter still listed here goes back to 2008.

11 systems were switched on in the past 12 months. Approved additions not yet in service are pending on 3 existing masts, for example Bouygues Telecom (4G and 5G) at 14 Cours du Danube, Bouygues Telecom (5G 2100 MHz) at 7 Cours du Danube and Free Mobile (5G 700 MHz) at Les Prés de la Fontaine. 1 Bouygues Telecom 5G transmitter is listed as technically operational — installed, but not yet declared commercially in service.

Coupvray lies 5.4 km to the north and has only 5 masts.

Of the 10 masts in the commune, only one mast carries all four networks.

By mast count, Serris is 20th of the 52 Seine-et-Marne towns that have five or more. With 10 masts for 10,326 residents, or 10 per 10,000, it has more masts per inhabitant than the median for those towns (6).

At 6 km² with 10,326 residents, the commune is dense enough that most antennas sit on rooftops rather than pylons. It is part of the CA Val d'Europe Agglomération intercommunal grouping.

Most of the town's 10 masts are buildings (8).

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