Post Office - Wynnewood 115 E Robert S Kerr Blvd Wynnewood, OK 73098 Phone : (405) 665-4235 Business Category Post Offices Toll-Free           (800) ASK-USPS Government Offices-u S--wynnewood, Post Office 115 E Kerr Blvd Wynnewood, OK 73098 Phone : (405) 665-4235 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools