| Code | Name |
| NEM | (NEM Unattached - No Workout Group) |
| ABC | ABC Masters - Gray Sharks |
| AAC | Adirondack Athletic Club |
| ALBRY | Allston-Brighton YMCA (MA) |
| ANA | Andover YMCA (MA) |
| ABORY | Attleboro YMCA |
| BGSC | Bernal's Gators Masters (Waltham, MA) |
| BLUE | Blue State Masters |
| ABF | Bluefish Masters |
| BOROY | Boroughs YMCA |
| BC | Boston College |
| LANES | Boston LANES (Liquid Assets New England Swimming) |
| BSCW | Boston Sports Clubs - Wellesley |
| BUMS | Boston University Masters |
| BOSY | Boston YMCA (Central Branch) |
| BSCM | Bridgewater State Masters |
| BRYNT | Bryant College |
| CMSC | Cambridge Masters (at Harvard) |
| CCM | Cape Cod Masters |
| CONC | Concord YMCA (NH) |
| DUX | Duxbury (MA) (Percy Walker Pool) |
| FITCH | Fitchburg YMCA (MA) |
| GSP | Granite State Penguins (NH) |
| HOCK | Hockomock YMCA (MA) |
| JCCNM | JCC Newton Masters (MA) |
| JCCNS | JCC North Shore (Marblehead, MA) |
| KEENE | Keene Swim Masters (NH) |
| KINGS | Kingsbury Club (Kingston, MA) |
| LONG | Longfellow (Natick, MA) |
| LOWY | Lowell YMCA |
| LUDLW | Ludlow Community Center (MA) |
| MIT | Massachusetts Institute of Technology |
| MEDF | Medford Masters (MA) |
| MEMPH | Memphremagog Masters |
| MUFF | Middlebury Muffintops (Middlebury, VT) |
| MMAN | Minuteman Masters |
| NBPTY | Newburyport YMCA (Newburyport, MA) |
| NSBRY | North Suburban/Burbank/Reading YMCA |
| NHJFK | Northampton JFK (MA) |
| OSM | Ocean State Masters |
| SIMM | Simmons College |
| SROCK | Simon's Rock |
| SOCOY | South County YMCA |
| SOSHY | South Shore YMCA |
| SAM | Suburban Athletic Masters (Framingham, MA) |
| SWMRI | Swim Rhode Island |
| CSPLIT | The Cape Splitters |
| TRIY | Tri-Y |
| TWOAK | Twin Oaks (Burlington, VT) |
| UMASS | UMass Amherst |
| UCLUB | University Club of Boston |
| UVRAY | UV Rays (Woodstock, VT) |
| WALTH | Waltham YMCA (MA) |
| WEST | Westfield Boys Club (MA) |
| WHEAT | Wheaton Wahoos (Norton, MA) |
| YNS | YMCA of the North Shore (Beverly, MA) |