Membership Ankeny Area Business Directory Map for Karl Auto Group - Karl Buick GMC of Marshalltown Map for Karl Auto Group - Karl Buick GMC of Marshalltown Search | Advanced Search | New Members | Coupons and Discounts | All Categories Automotive, Aviation & Marine >> Automotive >> Dealers Karl Auto Group - Karl Buick GMC of Marshalltown 1000 N. 3rd Ave.Marshalltown, IA 50158 | directions (641) 351-7829 Visit Site If your business isn't here, contact us today to get listed! Subscribe to our Newsletter Name* First Last Email* Security Policy Marketing Opportunities Member Login