Human Services Department 1000 W 31st St Yankton, SD 57078 Phone : (605) 668-3107 Business Category Administration Of Social Human Resource & Income Maintenance Programs South Dakota State Of--yankton, Human Services Center, Business Office 1000 W 31st St Yankton, SD 57078 Phone : (605) 668-3107 Business Category Government Offices-State Social Service & Welfare Organizations Government Offices State & Local Government Offices & Public Schools