Obrien County Of--treasurers Office, Tax Department 155 S Hayes Ave Primghar, IA 51245 Phone : (712) 957-3210 Business Category Government Offices-County Public Finance Taxation & Monetary Policy Government Offices & Public Schools Obrien County Treasurer 155 S Hayes Ave Primghar, IA 51245 Phone : (712) 957-3210 Business Category Public Finance Taxation & Monetary Policy