United States Government--postal Service-u S-washburn, Iron Belt Iron Belt Washburn, WI 54891 Phone : (715) 561-5160 Business Category Government Offices & Public Schools Post Office - Iron Belt 11715 Mckinnan St Iron Belt, WI 54536 Phone : (715) 561-5160 Post Office - Iron Belt Business Category Post Offices Toll-Free           (800) ASK-USPS