Red Willow County Of--treasurer Courthouse Mc Cook, NE 69001 Phone : (308) 345-6515 Business Category Government Offices-County Government Offices & Public Schools Red Willow County Treasurer 502 Norris Ave Mc Cook, NE 69001 Phone : (308) 345-6515 Business Category Government Offices-County Public Finance Taxation & Monetary Policy Government Offices & Public Schools