Franklin County Marriage License 400 E Main St # 102 Union, MO 63084 Phone : (636) 583-7342 Business Category Government Offices-County Legislative Bodies Franklin County Of--assessor-personal Property Div, Marriage License Union, MO 63084 Phone : (636) 583-7342 Business Category Government Offices-County Government Offices & Public Schools Franklin County Of--court House, Marriage License Union, MO 63084 Phone : (636) 583-7342 Business Category Government Offices-County Government Offices & Public Schools