| Name | Deductibility Code |
| A Childs Garden Montessori Inc. | -- |
| Castle Family Foundation | 4 |
| Coast Guard Foundation Inc. | -- |
| Conneticut Maritime Foundation Inc. | 4 |
| Cush Inc. | -- |
| Daniel O Potter Charitable Fndn | 4 |
| Deans Mill Elementary School Parent Teacher Organization | -- |
| Dolphin Communication Project Inc. | -- |
| Friends of Stonington Crew Inc. | -- |
| La Casa De Mi Padre | -- |
| Leslie E Buck Memorial Fund | -- |
| Life Edu Org Inc. | -- |
| Mpmm Foundation Inc. | 4 |
| Mystic Paper Beasts Incorporated | -- |
| New Life Ministries of Stonington Inc. | -- |
| Pine Point School Inc. | -- |
| Play Ball Foundation Inc. | -- |
| Rotary Foundation of the Stoningtons Inc. | -- |
| Salt Marsh Opera Company | -- |
| Sewell Sillman Foundation Inc. | -- |
| Shyc Sailing Foundation Inc. | -- |
| Stanton-Davis Homestead Museum Inc. | -- |
| Stonington Ambulance Corps Inc. | -- |
| Stonington Cemetery Association Inc. | 6 |
| Stonington Community Center Inc. | -- |
| Stonington Free Library Association | -- |
| Stonington Historical Society | -- |
| Stonington Land Trust Inc. | -- |
| Stonington Soccer Club Inc. | -- |
| Stonington Tricentennial Scholarship Fund | -- |
| Stonington Village Improvement Association Incorporated | -- |
| Terra Firma Farm Inc. | -- |
| The Maurice C and Winifred Glover La Grua Foundation Inc. | -- |
| Thomas & Marguerite Moore Family Foundation | 4 |
| Wimpfheimer Foundation Inc. | 4 |