Margaret River Police have confirmed Jacob Raymond Costar, 29, and his son Ethan, 9, were located on Saturday morning after going missing in the south west town on Friday.
The pair were reported missing after their last sighting at Watershed Winery, just south of the Margaret River townsite, at around 12.30pm on Friday August 4.
Mr Costar was driving a silver Holden Commodore sedan which was later found abandoned in Margaret River.
Local police resumed the search on Saturday morning with volunteers from the State Emergency Service assisting and the pair were located shortly after.
The father and son have been taken to Margaret River Hospital for assessment.