| Casino | Code |
| Main Street Station | MSS |
| Marina | MAR |
| Maxim | MAX |
| MGM | MGM |
| ..... Arcade Tokens | - |
| ..... No Cash Value Chips | - |
| Million Dollar | MDX |
| Mint, Del Webb's | MDW |
| Monte Carlo Casino | MCC |
| Motel 6 | M6X |
| Mr Sy's | MSX |
| ..... Free Play Token | - |
| ..... Free Play Chip | - |
| ..... Paper Items | - |
