| Business | Phone |
| County Collector 300 E Main St # 103, Union 63084 | (636) 583-6353 |
| County Commission 300 E Main St # 201, Union 63084 | (636) 583-6358 |
| Data Processing 300 E Main St # 204, Union 63084 | (636) 583-6395 |
| Franklin Cnty Juvenile Dtntn 401 E Springfield Ave, Union 63084 | (636) 583-7373 |
| Franklin Cnty Marriage License 300 E Main St # 101, Union 63084 | (636) 583-7342 |
| Franklin County Addressing 300 E Main St # 204, Union 63084 | (636) 583-6055 |
| Franklin County Bldg Dept 8 N Church St # C, Union 63084 | (636) 583-6384 |
| Franklin County Data Proc Dept Union 63084 | (636) 583-6305 |
| Franklin County Juvenile Ofc 4 S Church St, Union 63084 | (636) 583-7333 |
| Franklin County Mappg Dept-It 300 E Main St # 204, Union 63084 | (636) 583-6390 |
| Franklin County Public Admin 211 E Main St, Union 63084 | (636) 583-7377 |
| Franklin County Ucc Filing 300 E Main St # 101, Union 63084 | (636) 583-6368 |
| Highway Garage 1360 Riverview Dr, Union 63084 | (636) 583-2444 |
| Marriage License Bureau 300 E Main St # 101, Union 63084 | (636) 583-6367 |
| University-Mo Extension Ctr 116 W Main St, Union 63084 | (636) 583-5141 |
| Voter Registration & Elections 300 E Main St # 201, Union 63084 | (636) 583-6364 |