| Name | Deductibility Code |
| Alliance of New York State Arts Councils Inc. | -- |
| Ames Feline Adoption & Rescue Inc. | -- |
| Charles M Cappellino Foundation Inc. | 4 |
| Community Christian Fellowship | -- |
| East End Special Education Parents Inc. | -- |
| Ecumenical Nursery School Inc. | -- |
| Friends of the Mattituck Free Library Inc. | -- |
| Friends Unlimited Inc. | -- |
| Mattituck Community Fund Inc. | -- |
| Mattituck Cutchogue Fund for Students Inc. | -- |
| Mattituck Historical Society Inc. | -- |
| Mattituck Laurel Library | -- |
| North American Fruit Explorers | -- |
| North Fork Audubon Society | -- |
| North Fork Audubond Society Inc. | -- |
| North Fork Church of Christ Inc. | -- |
| North Fork Community Theatre Inc. | -- |
| North Fork Environmental Council Inc. | -- |
| North Fork Italian American Club Inc. | -- |
| Peconic Chamber Orchestra Inc. | -- |
| Shoreham Bmx Parents Association | -- |
| Southold Town Volunteer Fire Fighters Memorial | -- |
| The Dr Adele V Deckinger Family Foundation Inc. | 4 |
| Timothy Casey Memorial Fund | -- |