| 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 Club | MBT | All Bridge Saints | MC4 | Chicago Sectional | ||||||
| MC5 | Crystal Lake Sectional | MCL | CBG Thursday | MCO | ??? | ||||||
| MCR | Chicago Duplicate Bridge | 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 | MLJ | New Lenox-Joliet DBC | MLS | Lawson Bridge Studio | ||||||
| MLT | ??? | 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 | MTT | Tree Towns DBC | ||||||
| MUD | Reluctant Redoubler DBC | MW5 | Wheeling Sectional | MWS | West Suburban DBC | ||||||
| MWV | Wheaton Thursday DBC | MYV | Yorkville DBC |