NIMI'IPUU NEZ PERCE   Nez Perce Territory: Upstate Idaho - northeast Oregon - southeast Washington State.   Portals .   Nez Perce Tribe Lapwai, Idaho   Confederated Tribes of the Colville Reservation : part of whose membership is Nez Perce Nespelem, Washington Nez Perce Population United States (2010) - 4,200 P E N U T I A N