Directions to Threadlines Inc. Search | Advanced Search | New Members | Coupons and Discounts | All Categories Advertising & Media >> Promotional Products Threadlines Inc. 1889 Sun Dolphin RoadMuskegon, MI 49444 | map 231-739-2112 | fax: 231-733-0211 Get directions to: Threadlines Inc., 1889 Sun Dolphin Road, Muskegon MI Get directions from: Click to Print This Page If you would like to see your business here, contact us today to get listed!