The organisation named Communauté d'Agglomération du Grand Sénonais is a group of municipalities in the department of the Yonne, in Burgundy-Franche-Comté. The total population of this intermunicipal organisation is 60706 inhabitants, spread across a surface area of 375.15 km². The population density is 140 inhabitants/km². The maximum altitude is 246 metres. The Communauté d'Agglomération du Grand Sénonais public intermunicipal cooperation establishment comprises the 27 municipalities listed below.
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