| Name | Deductibility Code |
| Concerned Citizens of Montauk Inc. | -- |
| East Hampton Group for Wildlife Inc. | -- |
| East Lake Association of Montauk Inc. | -- |
| Friends of Montauk Downs Inc. | -- |
| Friends of the Montauk Library | -- |
| Hamptons Collegiate Baseball League Inc. | -- |
| Long Island Communities of Practice | -- |
| Montauk Artists Association Inc. | -- |
| Montauk Chamber Music Society Inc. | -- |
| Montauk Community Senior Nutrition Center | -- |
| Montauk Fire Department | 6 |
| Montauk Historical Society Montauk Ny | -- |
| Montauk Library | -- |
| Montauk Marine Science Institute Inc. | -- |
| Montauk Playhouse Community Center Foundation Inc. | -- |
| National Emergency Response and Rescue Inc. | 4 |
| Third House Nature Center Inc. | -- |