| Adventures In Scuba | PADI dive center in Chicago, IL |
| Berry Scuba | Dive center in Illinois |
| Captain Dale's Dive Center | Dive center in Wheeling, Illinois |
| Illinois Institute of Diving | NAUI dive center in Glen Ellyn, IL with Nitrox and rebreathers |
| Midwest Diving Specialists | Dive center in Normal, Illinois |
| Professional Diving Instructors Corportation | Dive instruction in Chicago, IL |
| Scuba Emporium | Dive center in Alsip and Orland Park, Illinois |
| Underwater Safaris on Lincoln | Dive center in Chicago, Illinois |
| West Shore Aqua Sports | PADI dive center in Winthrop Harbor, IL with instruction and day boat with trips on Lake Michigan |