| Business | Phone |
| St Charles City Electric-Const 2 E Main St, Saint Charles 60174 | (630) 377-4407 |
| St Charles City Finance 2 E Main St, Saint Charles 60174 | (630) 377-4422 |
| St Charles City Human Resource 2 E Main St, Saint Charles 60174 | (630) 377-4446 |
| St Charles City Offices 2 E Main St, Saint Charles 60174 | (630) 377-4400 |
| St Charles City Offices 3805 Lincoln Hwy, Saint Charles 60175 | (630) 377-4324 |
| St Charles City Purchasing 2 E Main St, Saint Charles 60174 | (630) 377-4449 |
| St Charles Engineering 2 E Main St, Saint Charles 60174 | (630) 377-4486 |
| St Charles Esda 105 N 1st Ave, Saint Charles 60174 | (630) 377-4417 |
| St Charles Purchasing Dept 2 E Main St, Saint Charles 60174 | (630) 377-4989 |
| St Charles Refuse-Recycling Saint Charles 60174 | (630) 377-4489 |
| St Charles Twp Supervisor Ofc 1725 Dean St, Saint Charles 60174 | (630) 584-9342 |
| Campton Twp Supervisors Office 4n972 Brown Rd, Saint Charles 60175 | (630) 365-9366 |