Jefferson County Prosecuting 300 2nd St Hillsboro, MO 63050 Phone : (636) 797-5321 Business Category Government Offices-County Legislative Bodies Jefferson County Court House--23rd Judicial Circuit, Prosecuting Attorney, Main Number Hillsboro, MO 63050 Phone : (636) 797-5321 Business Category Government Offices-County County Government-Courts Courts Government Offices & Public Schools