Agnin is located some 25 km south ofVienne and 5 km north-east ofSaint-Rambert-d'Albon. It can be accessed by the road D519 from nearChanas in the west passing through the southern part of the commune and continuing toBouge-Chambalud. Parallel to this road in the north of the commune is the D51 road fromSalaise-sur-Sanne in the west passing through the commune and the village and continuing toAnjou in the east. The D131 also comes from theVille-sous-Anjou in the north joining the D51 west of the village. The Route de Bouge connects the village to the D519 in the south of the commune. The commune is mostly farmland with significant areas of housing in the north and some small areas of forest in the south.[4]
An unnamed stream flows south forming the western border of the commune and another unnamed stream flows through the commune then forms the south-western border. They both join in the south-west and continue flowing west. TheDolon stream forms the southern border of the commune
Like the nearby town ofAnjou the origin of the nameAgnin comes from the name of a Roman nobleAnianus who owned vast territory in that era. The name of the town changed a few centuries later toAgnino which was the name used in the 11th century to describe this commune. Then over the following centuriesAgnino became theAgnin known today.[5]
Party per bend sinister, one of Or a local church soutenu at dexter by an inescutcheon with two keys saltirewise and sinister in chief a Vol all represented in lines; two of gules a dolphin of Or at dexter and a rose gules stalked and leaved in vert; in the cotice a bend sinister in Or charged with the letters AGNIN in sable debruised on the division.
^"Répertoire national des élus: les maires".data.gouv.fr, Plateforme ouverte des données publiques françaises (in French). 2 December 2020.Archived from the original on 28 June 2020. Retrieved9 April 2021.