| Name | Deductibility Code |
| A Childs Hope for Independence Learning and Development Corp | -- |
| Arthur Leon Horniker Tr UW | 4 |
| Davidson Family Foundation Inc. | 4 |
| Doris M & Peter S Tilles Foundation Inc. | 4 |
| Falcon Pride Association Inc. | -- |
| Felix Organization - Adoptees for Children Inc. | -- |
| Foundation for Remote Jewish Communities Inc. | -- |
| Friends Academy | -- |
| Friends of Nassau County Bailey Arboretum | -- |
| Friends of the Locust Valley Library | -- |
| Grenville Baker Boys and Girls Club Inc. | -- |
| James M Large Jr Family Foundation | 4 |
| Janet Darling Webel Memorial Fund | 4 |
| John R & Hope Reese Foundation | 4 |
| Judamnaun Evangelical Church of New York Inc. | -- |
| Karches Foundation | 4 |
| Larry and Anne Glenn Foundation Inc. | 4 |
| Locust Valley Cemetery Association Inc. | 6 |
| Locust Valley Historical Society | -- |
| Locust Valley Library | -- |
| Locust Valley Rotary Club Foundation Inc. | -- |
| Locust Valley Tennis Association Inc. | -- |
| Maier Foundation Inc. | 4 |
| Matinecock Neighborhood Association | -- |
| McClean Family Foundation | 4 |
| Nassau First Corporation | -- |
| New York Brass Choir Inc. | -- |
| North Country Community Assoc Inc. | -- |
| North Shore Wildlife Sanctuary Inc. | -- |
| Operation Democracy Inc. | -- |
| Pet Safe Coalition Inc. | -- |
| Portledge School | -- |
| Rolf and Elizabeth Rosenthal Family Foundation | 4 |
| Slanetz Science Foundation Inc. | 4 |
| Spector Family Foundation | 4 |
| Support for People With Oral and Head and Neck Cancer Inc. | -- |
| The Humes Japanese Garden Foundation Inc. | 4 |
| The Merrilyn Foundation | 4 |
| The Richard Lippold Foundation | 3 |
| The Riot Group Inc. | -- |
| The Seligson Foundation | 4 |