- Confederated Tribes of the Umatilla Indian Reservation PO Box 638 Pendleton, Oregon 97801 (or for parcel deliveries: 73239 Confederated Way) Phone: (541) 276-3165 FAX: (541) 276-3095 E-mail us at the Confederated Umatilla Tribes 1996-00 CTUIR Web space courtesy of Unicom, Inc. - (541) 276-6653 ...www.umatilla.nsn.us