| Name | Deductibility Code |
| Camp Northstar Inc. | -- |
| Dr Philip R Fleishman Foundation | -- |
| Fred Biangardi Memorial Baseball Scholarship Fund | 4 |
| Friends of the Islip Public Library | -- |
| Historical Society of Islip Hamlet | -- |
| Iglesia Roca De Salvacion Inc. | -- |
| Islip Booster Club Ltd. | -- |
| Islip Buccaneer Youth Football Inc. | -- |
| Islip Childrens Endowment Fund | -- |
| Islip Rotary Supporters Inc. | -- |
| Islip School Age Child Care Corporation | -- |
| Kiwanis Club of the Islips Bay Shore Foundation Inc. | -- |
| Long Island Aquarium Society Inc. | -- |
| Long Island Golden Retriever Rescue Inc. | -- |
| Love & Mercy Fellowship | -- |
| Mid Island Baptist Temple C O Rev Bob Badertscher | -- |
| Mu Foundation | -- |
| Music Lovers Club Inc. | -- |
| New Bethany Baptist Church | -- |
| Operation Homeless Inc. | -- |
| Seatuck Environmental Assn Inc. | -- |
| Shelter Link | -- |
| South Side Garden Club of Long Island Inc. | -- |
| Sports Moms Inc. | 4 |
| Transitional Housing Employing Islip Rehab Homes Inc. | 4 |
| West Islip Youth Enrichment Services Incorporated | -- |