Several. Just off the top of my head; Ancient Jericho, Çatalhöyük, and Harappa. Neutral Moresnet, Celtic Medeival Ireland under Brehon Law, Pre-Communist Somali

Several. Just off the top of my head; Ancient Jericho, Çatalhöyük, and Harappa. Neutral Moresnet, Celtic Medeival Ireland under Brehon Law, Pre-Communist Somalia under Xeer Law, Medeival Iceland under Godhordh Law, and many pockets of modern society peacefully cooperating without centralized supervision.