The municipality covers an area of 1042 ha is located on a ridge between two tributaries of Garon, the Merdançon and Casanona. The people call the Orliénasiens. Orliénas comes from the Latin " Aurelianum " The town took the name Orliénas in 1339.
In 1267, in the cartulary Abbey Ainay are mentioned names still used today places called and allowed to designate street names.