The Gadarenes were the inhabitants of Gadara or of the territory under its authority. The name could therefore describe people associated with the principal city of the region, even when the event occurred elsewhere within that territory.
Matthew calls the district in the demoniac narrative the country of the Gadarenes, while Mark and Luke use the designation Gerasenes in the parallel accounts. The Gospel terminology identifies the general region associated with the miracle.
Gadara was the chief city of the surrounding district. Its jurisdiction extended over country east of the Sea of Galilee and apparently included areas associated with subordinate local centers.