U S Government--post Offices, Isabella 255 Us Highway 160 Theodosia, MO 65761 Phone : (417) 273-4550 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Isabella 8 Us Highway 160 Isabella, MO 65676 Phone : (417) 273-4550 Post Office - Isabella Business Category Post Offices Toll-Free           (800) ASK-USPS