Alter Trading Corporation Mason City, IA Contact Information 12050 W State St , Mason City, IA, Iowa 50401 (641) 424-9521 https://www.altertrading.com/ Location Get Directions By car By public transit Walking Bicycling HoursPlease call for our latest hours. Metals Aluminum Scrap Brass Copper Ferrous Metals Nonferrous Metals Stainless Steel Zinc 1 2 3 4 50.000 Does this listing contain inaccurate information? If so please send us a correction. Your name Your email Subject Please describe what corrections need to be made to the listing.