| Code | | Site | | Code | | Site | | Code | | Site |
| YAB | | Amesbury Duplicate BC | |
YAV | | Andover DBC | |
YB7 | | Barnstable Sectional | |
| YBB | | ??? | |
YBM | | Belmont Duplicate Bridge Club | |
YBS | | The Bridge Spot | |
| YC7 | | Chatham Sectional | |
YCH | | ??? | |
YCS | | Classy Seniors DBC | |
| YCT | | ??? | |
YDM | | Dartmouth BC | |
YDW | | Dedham Invitational | |
| YDY | | D-Y Senior Citizens DBC | |
YEH | | Eastward Ho! BC | |
YF5 | | Falmouth Sectional | |
| YFX | | Fox Hill Village Bridge Club | |
YGC | | Essex Country Club | |
YGI | | Great Island Duplicate Bridge | |
| YH7 | | Hyannis Sectional | |
YIH | | Hamilton DBC | |
YKY | | Kathy's Bridge Club | |
| YMD | | MIT/DL Bridge Club | |
YMF | | Marshfield Senior Center | |
YMG | | ??? | |
| YMW | | Metrowest Bridge | |
YN5 | | New Castle Sectional | |
YN7 | | Newton Sectional | |
| YNB | | Nantucket Bridge Club | |
YNN | | Bay State Bridge Club | |
YNO | | North Hill Bridge Club | |
| YOH | | Oyster Harbors Club | |
YPT | | Puritan Bridge Club | |
YRH | | Monomoy Bridge Club | |
| YS4 | | Sandwich Sectional | |
YSM | | Saltmarsh DBC | |
YTB | | ??? | |
| YUC | | Upper Cape Bridge Club | |
YW4 | | Watertown Sectional | |
YW6 | | Woburn Sectional | |
| YW8 | | Westwood Sectional | |
YWC | | The DBC of Winchester | |
YWL | | Willowbend Duplicate Bridge | |
| YWW | | Westwood DBC | |
YWY | | Wellesley Country Club BC | |