Okanogan County Cooperative Ext 149 3rd St N # 101 Okanogan, WA 98840 Phone : (509) 422-7245 Business Category Government Offices-County Legislative Bodies Washington State Government--wsu Extension, Grant County, Okanogan Okanogan, WA 98840 Phone : (509) 422-7245 Business Category Government Offices-State Government Offices State & Local Government Offices & Public Schools Okanogan County--cooperative Extension Po Box 391 Okanogan, WA 98840 Phone : (509) 422-7245 Business Category Government Offices-County Government Offices & Public Schools