U S Government--smithton Smithton, MO 65350 Phone : (660) 343-5330 Business Category Government Offices & Public Schools Post Office - Smithton 104 S Walnut Ave Smithton, MO 65350 Phone : (660) 343-5330 Post Office - Smithton Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--post Offices, Smithton Smithton, MO 65350 Phone : (660) 343-5330 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools