| Business | Phone |
| Engineered Security Solutions 9821 S 13th St, Oak Creek 53154 | (414) 856-9300 |
| Innovative Systems Inc 9880 S Ridgeview Dr, Oak Creek 53154 | (414) 761-7350 |
| Vid-Com Engineering 9880 S Ridgeview Dr, Oak Creek 53154 | (414) 304-9933 |
| Northern Computers Inc 135 W Forest Hill Ave, Oak Creek 53154 | (414) 766-1700 |