Post Office - Belfry 115 Vaill Ave Belfry, MT 59008 Phone : (406) 664-3305 Business Category Post Offices Toll-Free           (800) ASK-USPS U S Government Offices--post Office Belfry Belfry, MT 59008 Phone : (406) 664-3305 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools