U S Government--internal Revenue Service, Roscoe Post Office 100 Pecan St Osceola, MO 64776 Phone : (417) 646-8210 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Roscoe 100 Pecan St Roscoe, MO 64781 Phone : (417) 646-8210 Post Office - Roscoe Business Category Post Offices Toll-Free           (800) ASK-USPS