United States Government--worthing, Post Office 119 Main Worthing, SD 57077 Phone : (605) 372-4165 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Worthing 120 S Main St Worthing, SD 57077 Phone : (605) 372-4165 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (605) 357-4906