United States Government--u S Post Office 108 N Main St Gilman, IA 50106 Phone : (641) 498-7762 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Gilman 108 N Main St Gilman, IA 50106 Phone : (641) 498-7762 Post Office - Gilman Business Category Post Offices Toll-Free           (800) ASK-USPS