| Name | Deductibility Code |
| African-American Educational and Cultural Festival Inc. | 4 |
| Aid to the Developmentally Disabled Inc. | -- |
| Bridge Improving Access to Health Care Inc. | -- |
| Central Suffolk Hospital | -- |
| Central Suffolk Hospital Foundation | -- |
| Child Development& learning Center Inc. | -- |
| Christian Development Center Inc. | -- |
| Church of the Harvest | -- |
| Community Bible Church | -- |
| Community Center for Blind and Sighted | -- |
| Council for the Vail-Leavitt Music Hall Inc. | -- |
| Donald E Reutershan Educational Tr | -- |
| East End Arts & Humanities Council | -- |
| East End Church of Christ Inc. | -- |
| East End Disability Associates Inc. | -- |
| East End Full Gospel | -- |
| Eastern Long Island Blues Alliance Inc. | -- |
| Eeda Foundation Inc. | -- |
| Feingold Association of the United States Inc. | -- |
| Flanders Riverside and Northampton Community Association Inc. | -- |
| Framingham Foundation | 4 |
| Friendship Baptist Church of Riverhead | -- |
| Goodfellows Club of Suffolk County Inc. | -- |
| Gospel Music Scholarship Inc. | 4 |
| Gwen L Kosinski Foundation Inc. | -- |
| Hallockville Inc. | -- |
| House of Praise Christian Revival Center Inc. | -- |
| Indian Network of Eastern Long Island Inc. | -- |
| John Wesley Village II Inc. | 4 |
| Laurents Hatcher Foundation Inc. | 4 |
| Living Water Full Gospel Church Inc. | -- |
| Long Island Antique Power Association | -- |
| Long Island Organization Network Inc. | -- |
| Long Island Regional Envirothon Ltd. | -- |
| Lovem Sheltering Inc. | -- |
| Lt Michael P Murphy Usn Memorial Scholarship Foundation | -- |
| Marcos 16 15 | -- |
| New Life Ministries | -- |
| North Fork Breast Health Coalition Inc. | -- |
| North Shore Christian Church | -- |
| Open Arms Care Center Inc. | -- |
| Paumanok Weavers Guild | -- |
| Peconic Community Council | -- |
| Peconic United Methodist Housing Development Fund Company Inc. | -- |
| Power & Dominion Ministries | -- |
| Power of Prayer Ministry | -- |
| Praying Hands Fellowship | -- |
| Riverhead Business Improvement District Management Assoc Inc. | -- |
| Riverhead Cemetery Association | 6 |
| Riverhead Community Awareness Program Inc. | -- |
| Riverhead Development Corp | 4 |
| Riverhead Faculty and Community Theatre Inc. | -- |
| Riverhead Foundation for Marine Research and Preservation | -- |
| Riverhead Free Library | -- |
| Riverhead Lacrosse Club Inc. | -- |
| Riverhead Theatre Corp | -- |
| Riverhead Volunteer Ambulance Corps Inc. | -- |
| Suffolk County Historical Society | -- |
| Suffolk County Provincial Militia Inc. | -- |
| The Long Island Pine Barrens Society | -- |
| The Place for Learning Inc. | -- |
| Timothy Hill Childrens Ranch Inc. | -- |
| Word of Life Ministries of Riverhead | -- |