| Business | Phone |
| Tremont Software 14105 N Tolle Ln, Mt. Vernon 62864 | (618) 244-4230 |
| Software Technology Inc 123 S 10th St # 503, Mt. Vernon 62864 | (618) 244-4230 |
| Computer Management Assistance 104 N 9th St, Mt. Vernon 62864 | (618) 242-4020 |
| Eight's Enuff Custom Computers 1709 Harrison St, Mt. Vernon 62864 | (618) 732-0324 |