Us Social Security Admin 3555 Southern Hills Dr Sioux City, IA 51106 Phone : (712) 274-8706 Us Social Security Admin Business Category Administration Of Social Human Resource & Income Maintenance Programs United States Government--social Security Administration, Rtrmnt-srvvrs-dsblty Or Spplmntl Scrty Incm-ss Bnf, Office Locations/hours 9 Am 4 Pm 3555 Southern Hills Dr Sioux City, IA 51106 Phone : (712) 274-8706 Business Category Government Offices-Federal Government Offices & Public Schools