United States Government--tyndall, Post Office 1716 Main St Tyndall, SD 57066 Phone : (605) 589-3984 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Tyndall 1716 Main St Tyndall, SD 57066 Phone : (605) 589-3984 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (605) 357-4906