United States Government--united States Postal Service 222 W Main St Canistota, SD 57012 Phone : (605) 296-3392 Business Category Government Offices-Federal Government Offices & Public Schools Post Office - Canistota 222 W Main St Canistota, SD 57012 Phone : (605) 296-3392 Post Office - Canistota Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (605) 357-4906