Sioux County Assessor 210 Central Ave Sw Orange City, IA 51041 Phone : (712) 737-4274 Business Category Public Finance Taxation & Monetary Policy Sioux County Of--county Assessor Orange City Courthou Orange City, IA 51041 Phone : (712) 737-4274 Business Category Government Offices-County Government Offices & Public Schools Sioux County Of--assessor (county) Court House Orange City, IA 51041 Phone : (712) 737-4274 Business Category Government Offices-County Government Offices & Public Schools