| Code | | Site | | Code | | Site | | Code | | Site |
| MA5 | | Arlington Hights Sectional | |
MAC | | Ace of Clubs | |
MAJ | | The Ace of Clubs Jeremiah/Tues | |
| MAL | | Admiral at the Lake Bridge Clu | |
MBT | | All Bridge Saints | |
MC4 | | Chicago Sectional | |
| MC5 | | Crystal Lake Sectional | |
MCL | | CBG Thursday | |
MCO | | ??? | |
| MCT | | Chicago Cultural Center Monday | |
MCY | | Country Club Bridge League | |
MD5 | | Darien Sectional | |
| ME4 | | Elmhurst Sectional | |
MEW | | New Eazy Bridge/Wednesday | |
MFX | | Fox Bridge | |
| MG6 | | Glenview Sectional | |
MGE | | Glen Oak Country Club | |
MH5 | | Highland Park Sectional | |
| MHD | | Hinsdale DBC | |
MJT | | Tom's Game | |
ML5 | | Lombard Sectional | |
| MLS | | Lawson Bridge Studio | |
MMA | | Mundelein Area DBC | |
MNE | | New Easy Bridge | |
| MNF | | ??? | |
MNN | | Northwestern | |
MNS | | Northshore DBC | |
| MNV | | Naperville DBC | |
MNW | | Northwestern DBC | |
MOL | | Oak Lawn DBC | |
| MOP | | Oak Park Country Club | |
MOY | | Olympia DBC | |
MP4 | | Palantine Sectional | |
| MQN | | Queen of Clubs | |
MR6 | | Rolling Meadows Sectional | |
MS4 | | Skokie Sectional | |
| MSB | | South Suburban Bridge Center | |
MTC | | The Claire | |
MUD | | Reluctant Redoubler DBC | |
| MW5 | | Wheeling Sectional | |
MWS | | West Suburban DBC | |
MWV | | Wheaton Thursday DBC | |
| MYV | | Yorkville DBC | |