Osage County Treasurer Court House Linn, MO 65051 Phone : (573) 897-3095 Business Category Public Finance Taxation & Monetary Policy Osage County Of--assessor, Treasurer Courthouse Linn, MO 65051 Phone : (573) 897-3095 Business Category Government Offices-County Government Offices & Public Schools Osage County Of--treasurer Court House Linn, MO 65051 Phone : (573) 897-3095 Business Category Government Offices-County Government Offices & Public Schools