Sanford North Mandan Clinic Share: Clinics & Medical Centers Sanford North Mandan Clinic Visit Website 910 18th Street NW Mandan, ND 58554-1612 (701) 667-5100 667-5095 (fax) Rep Info Map Whom to Contact Dale Klein, M.D. Darwin Lange, M.D. What's Nearby? Distance: 5 10 15 20 25 50 mi.