| Name | Deductibility Code |
| 1997 John and Mary Murphy Educational Foundation | 4 |
| Ambrose Parent Teacher Organization | -- |
| Another Chance Foundation | -- |
| Arthur Griffin Family Foundation | 4 |
| Arthur Griffin Foundation for Winchester | 3 |
| Barchan Foundation Inc. | -- |
| Bartlett School Inc. | -- |
| Beacon City Church | -- |
| Birchwood Charitable Tr | 4 |
| Boston Pledge Inc. | -- |
| Brio Integrated Theatre | -- |
| Caring Canines Visiting Therapy Dogs Inc. | -- |
| Chatham Trails Association | -- |
| Child Adoption Associates Inc. | -- |
| Childrens Own School Inc. | -- |
| Christopher N Mitropoulos Memorial Scholarship Fund | -- |
| Churches Serving International Inc. | -- |
| Cooperative Theatre for Children Inc. | -- |
| D Kim Foundation for the History of Science and Technology in East As | 4 |
| David K Johnson Foundation Inc. | 4 |
| Doe Family Foundation | 4 |
| El Hogar Ministries Inc. | -- |
| En Ka Society Inc. | -- |
| Family Action Network of Winchester Inc. | -- |
| Flag Heritage Foundation | -- |
| Friends of Flynn Rink Inc. | -- |
| Friends of Sachem Football Inc. | -- |
| Friends of the Winchester Public Library Inc. | -- |
| Friends of Winchester Recreation & Cummunity Services Inc. | -- |
| Friends of Winter Pond Inc. | -- |
| Gansett Foundation | 4 |
| Gilbert P Syswerda and Carol J Goodenough Charitable Foundation | 4 |
| Gulf Coast Volunteers for the Long Haul Inc. | -- |
| H E Thompson Foundation | 4 |
| Harvard Business School Womens Association | -- |
| Heath Family Foundation Inc. | 4 |
| Hebrew Institute of Boston Inc. | -- |
| Hope Christian Church Inc. | -- |
| Institute for Scientific Research Inc. | -- |
| International Aid for Children Inc. | -- |
| James and Sarene Willing Charitable Foundation | 4 |
| Jones Foundation Inc. | -- |
| Jumelage Inc. | -- |
| Kennedy Family Foundation | 4 |
| Khasm Foundation Tr | 4 |
| Kypros Net Inc. | -- |
| Learning Games Network | -- |
| Lincoln School Parents Association | -- |
| Lorraine Chapman the Company Inc. | 4 |
| Mandile Family Foundation Inc. | 4 |
| Mary E & John F Murphy Charitable Tr | 4 |
| Mass State Committee of the National Museum of Women in the Ar | -- |
| Mayflower Foundation Inc. | -- |
| Mike Pagliarulo Foundation Inc. | 4 |
| Morris Fam Charitable Foundation Tr | 4 |
| Muraco Elementary School Parents Association | -- |
| Neighborhood Co-Operative Nursery School Inc. | -- |
| Nextdoor Theater Group Company | -- |
| Parent to Parent Inc. | -- |
| Peter French Memorial Foundation | 4 |
| Popponesset Bay Yacht Club | -- |
| Reed Family Charitable Foundation | 4 |
| Resources for Rehabilitation Inc. | -- |
| Sachem Youth Baseball-Softball Association Inc. | -- |
| Sixseeds Foundation | 4 |
| Stephen R Baum Foundation | -- |
| Sustainable Winchester | -- |
| Temple Shirtikvah Inc. of Winchester | -- |
| The Charles G Talanian Family Foundation | 4 |
| The Creative Soul of Children Inc. | -- |
| The Griffin Museum of Photography Inc. | -- |
| The Jack and Eva Medzorian Foundation | 4 |
| The Massachusetts Global Education Program Inc. | -- |
| The Melissa Mason Memorial Scholarship Trust Fund | -- |
| Tibet Hope Foundation | -- |
| Twenty-First Century Initiative Inc. | -- |
| Village Empowerment Inc. | -- |
| Vinson-Owen Parents Association | -- |
| Winchester After School Program | -- |
| Winchester Basketball Association | -- |
| Winchester Committee for A Better Chance Inc. | -- |
| Winchester Community Access and Media Inc. | -- |
| Winchester Community Center Foundation Inc. | -- |
| Winchester Community Music School Trust | -- |
| Winchester Community Service Foundation Inc. | -- |
| Winchester Cooperative Nursery School Inc. | -- |
| Winchester Field Development Council | -- |
| Winchester Foundation for Educational Excellence Inc. | -- |
| Winchester Friends of Art Inc. | -- |
| Winchester Healthcare Management Inc. | 1 |
| Winchester Historical Society Inc. | -- |
| Winchester Hockey Parents Association Inc. | -- |
| Winchester Home & Garden Club | -- |
| Winchester Mount Vernon House | 3 |
| Winchester Multicultural Network Inc. | -- |
| Winchester Rotary Charitable Fund Inc. | -- |
| Winchester Scholarship Foundation | -- |
| Winchester Seniors Association Inc. | -- |
| Winchester Seniors Association Trust | -- |
| Winchester Soccer Club | -- |
| Winchester Sports Foundation Inc. | -- |
| Winchester Tomorrow Inc. | -- |
| Winton Club Winton Club Hospital Shop | -- |
| Wright Locke Farm Conservancy Inc. | -- |
| Zoroastrian Association of Greater Boston Area | -- |