Grandma’s Marathon Back to Search Grandma’s Marathon Categories Non-Profits Marathon Attractions/Entertainment/Recreation/Events PO Box 16234 , Duluth , MN , 55813 351 Canal Park Drive , Duluth , MN , 55802 (218) 727-0947 https://www.grandmasmarathon.com/ Share × Print Email Facebook LinkedIn X Pinterest Powered By GrowthZone