The Hin are as per the Halfling race from the Pathfinder Core Rulebook. The term halfling is considered rude and insulting to them. Nearly all Hin come from The Five Shires, a land neighboring Karameikos and Darokin. They are often found living beside other races in their respective countries. They can found in fairly large numbers in Darokin, Ierendi, Karameikos, and Thyatis.
Hin are of the Hairfoot appearance of the earlier versions of D&D instead of the stupid-looking, pointy-eared version of 3.5. The racial abilities and such remain unchanged however.