The organisation named Communauté de Communes du Grand Armagnac is a group of municipalities in the department of the Gers, in Occitanie. The total population of this intermunicipal organisation is 13604 inhabitants, spread across a surface area of 533.12 km². The population density is 21 inhabitants/km². The altitude varies between 59 metres and 232 metres. The Communauté de Communes du Grand Armagnac public intermunicipal cooperation establishment comprises the 25 municipalities listed below.