Dr. Donald N Johnston, DC is a health care provider primarily located in Longmont, CO. He graduated from medical school in 1963 and has 62 years of experience. His specialties include Chiropractor. Dr. Johnston has an average rating of 3 stars based on 4 patient ratings. Dr. Donald N Johnston has 11 areas of expertise, including Attention Deficit Disorder (ADD) / Attention Deficit Hyperactivity Disorder (ADHD), Depression, and Depressive Disorder.