United States Government--post Office, For Zip Code Information Call Casey, IA 50048 Phone : (641) 746-2618 Business Category Post Offices Government Offices & Public Schools United States Government--post Office Casey, IA 50048 Phone : (641) 746-2618 Business Category Post Offices Government Offices & Public Schools Post Office - Casey 101 E Grant St Casey, IA 50048 Phone : (641) 746-2618 Business Category Post Offices Toll-Free           (800) ASK-USPS