| Institution | Library | City | Date Joined |
| Amnesty International USA | Library | Somerville | 6/4/97 |
| Boston Scientific Corporation | Library | Natick | 3/2/00 |
| Cambridge Hospital | Medical Library | Cambridge | 11/2/98 |
| Camp. Dresser & McKee | Dresser Library | Cambridge | 5/30/97 |
| Caritas Norwood Hospital | Library | Norwood | 6/18/97 |
| Charles River Community Partnership for Children | Library | Medway | 8/30/2000 |
| Congregation Mishkon Tefila | Feinberg Library | Newton | 9/8/98 |
| Le Cordon Bleu - Boston | Library | Cambridge | 4/30/08 |
| Dedham Historical Society | Library | Dedham | 11/15/07 |
| Emerson Hospital | Lund Library | Concord | 10/09/98 |
| Environmental Health & Engineering, Inc. | Corporate Library | Newton | 2/22/2000 |
| GEO Centers, Inc. | Library | Newton | 6/27/97 |
| Gradient Corporation | Technical Reference Center | Cambridge | 3/1/98 |
| Hanscom Base Library | Library | Hanscom AFB | 11/4/2004 |
| Harvard University | Center for Middle Eastern Studies | Cambridge | 3/15/2000 |
| Healing Partners | Library | Framingham | 8/26/2002 |
| Health and Human Development Programs Library | Library | Newton | 5/26/2000 |
| Instrumentation Laboratory | Library | Lexington | 11/17/2000 |
| Lawrence Memorial Hospital | Fahey Library | Medford | 6/6/97 |
| Massachusetts Center for Career and Technical Education | Library | Lexington | 1/13/99 |
| Massachusetts Horticultural Society | Library | Wellesley | 9/26/2001 |
| MCI Concord | Library | Concord | 10/16/97 |
| MCI Framingham | Library | Framingham | 9/23/97 |
| McLean Hospital | Mental Health Sciences Library | Belmont | 2/4/2002 |
| Metrowest Medical Center | Library | Framingham | 2/4/99 |
| Metrowest Medical Center | Morse Campus Medical Library | Natick | 2/11/98 |
| Middlesex Law Library | Library | Cambridge | 6/9/97 |
| Mitre Corporation | Library | Bedford | 3/13/98 |
| National Heritage Museum | VanGorden-Williams Library | Lexington | 6/24/97 |
| Needham Historical Society | Library | Needham | 9/19/2002 |
| New England Research Institutes | Library | Watertown | 2/26/99 |
| Newton History Museum | Library | Newton | 3/29/2002 |
| Newton Wellesley Hospital | Babson Memorial Library | Newton | 6/18/97 |
| Norfolk County Sheriff's Office | Library | Dedham | 8/13/2003 |
| Norfolk Law Library | Library | Norwood | 5/30/97 |
| Pathfinder International | Library | Watertown | 6/6/97 |
| Perkins School for the Blind | Braille & Talking Book Library | Watertown | 6/23/2000 |
| Perkins School for the Blind | Samuel P. Hayes Research Library | Watertown | 4/13/2001 |
| Primary Source | Library | Watertown | 4/4/2001 |
| Regional Center for Healthy Communities | Library | Cambridge | 3/30/98 |
| Silent Spring Institute | Library | Newton | 8/14/2002 |
| Simpson, Gumpertz, & Heger, Inc | Library | Waltham | 4/21/06 |
| Somerville Hospital | Carr Health Sciences Library | Somerville | 12/12/97 |
| Temple Beth Am | Levine Library | Framingham | 6/27/2000 |
| Temple Beth Elohim | Library | Wellesley | 10/22/2002 |
| Temple Shir Tikva | Library | Wayland | 9/30/2000 |
| Thoreau Institute | Henley Library | Lincoln | 2/18/98 |
| US Army Corps of Engineers | Civil & Legal Library | Concord | 6/10/97 |
| Volpe Center | Technical Reference Center | Cambridge | 2/13/98 |
| Winchester Hospital | Health Sciences Library | Winchester | 8/13/99 |
| W.R. Grace & Company | GCP Technical Information Services | Cambridge | 6/20/97 |