Tonasket Medical Clinic. 106 South Whitcomb Avenue, Tonasket Washington 98855. P.O. Box 1340, Okanogan, WA 98840. Phone: (800) 660-2129. Fax: (855) 204-9535. Hours: 8am-5pm Mon-Fri | Closed 12pm-1pm for lunch. WITH COVID CASES RISING, WE ARE NOT ALLOWING VISITORS/VENDORS IN OUR CLINICS AT THIS TIME. PATIENTS MAY HAVE ONE FAMILY MEMBER WITH THEM ....