TUALATIN NORTHERN KALAPUYA : Click for SANTIAM or YONCALLA   Tualatin Territory: Northwest Oregon. Tualatin Divisions: Tualatin and Yamhill.     Portals .   Confederated Tribes of Grand Ronde : part of whose membership is Tualatin Grand Ronde, Oregon   Confederated Tribes of Siletz : part of whose membership is Tualatin Siletz, Oregon Tualatin Population United States (2010) - 450 K A L A P U Y A N