| Business | Phone |
| Draeger Interlock Of Oklahoma 514 Sw 25th St, Oklahoma City 73109 | (405) 605-3090 |
| Guardian Interlock Systems 3131 Nw 38th St, Oklahoma City 73112 | (405) 739-0600 |
| National Interlock Svc Ltd 3424 S Lakeside Dr, Oklahoma City 73179 | (405) 685-2522 |