| Business | Phone |
| Clayton Business Licenses 10 N Bemiston Ave, Clayton 63105 | (314) 290-8442 |
| Clayton City Engineering 10 N Bemiston Ave, Clayton 63105 | (314) 290-8540 |
| Clayton City Purchasing 10 N Bemiston Ave, Clayton 63105 | (314) 290-8475 |
| Clayton Human Resources 10 N Bemiston Ave, Clayton 63105 | (314) 290-8449 |
| Clayton Parking Tickets 227 S Central Ave, Clayton 63105 | (314) 290-8440 |