Post Office - National Stock Yards 79 Exchange St National Stock Yards, IL 62071 Phone : (618) 874-0458 Business Category Post Offices Toll-Free           (800) ASK-USPS National Stock Yards East Saint Louis, IL 62201 Phone : (618) 874-0458 Business Category Government Offices-Federal Government Offices & Public Schools United States Government--post Offices, East St Louis, National Stock Yards National Stock Yards, IL 62071 Phone : (618) 874-0458 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools