Richland County 418 2nd Ave N Wahpeton, ND 58075 Phone : (701) 642-7805 Business Category Government Offices-County Social Service & Welfare Organizations Individual & Family Social Services Government Offices & Public Schools Richland County Assessors Office 512 14th Ave N Wahpeton, ND 58075 Phone : (701) 642-7805 Business Category Government Offices-County Legislative Bodies