| Business | Phone |
| Charles City 1300 Grand Ave, Charles City 50616 | (641) 228-5055 |
| Comprehensive Systems Inc 1700 Clark St, Charles City 50616 | (641) 228-4842 |
| Comprehensive Systems Inc 310 9th St, Charles City 50616 | (641) 228-5785 |
| Comprehensive Systems Inc 515 13th Ave, Charles City 50616 | (641) 228-7380 |