Unemployment Insurance Tax Unt 2001 9th Ave Sw # 200 Watertown, SD 57201 Phone : (605) 882-5151 Business Category Administration Of Social Human Resource & Income Maintenance Programs South Dakota State Of--unemployment Insurance Tax Unit 715 S Maple Watertown, SD 57201 Phone : (605) 882-5151 Business Category Government Offices-State Management Consulting Unemployment Compensation Consultants Government Offices State & Local Administration Of Social Human Resource & Income Maintenance Programs Government Offices & Public Schools