| Name | Deductibility Code |
| Alliance for the Mentally Ill of Central Middlesex Massachusetts | -- |
| Ayer Community School Inc. | -- |
| Ayer Education Foundation Incorporated | -- |
| Ayer Public Access Corporation | -- |
| Congregation Anshey Sholom | -- |
| Deaconess-Nashoba Hospital Inc. | -- |
| Friends of Nashoba Valley Medical Center Inc. | -- |
| Loaves & Fishes Food Pantry Inc. | -- |
| Nashoba Management Services | -- |
| Nashoba Valley Christian Fellowship | -- |
| Nashoba Valley Housing Corp | 4 |
| New Hope Baptist Church Inc. | -- |
| North American Foundation for the University of Manchester Inc. | -- |
| North Middlesex Savings Charitable Foundation Inc. | 4 |
| People of Ayer Concerned About the Environment | -- |
| Thanksgiving Society Inc. | -- |
| The Boston Mycological Club | -- |
| The Halalisa Singers | -- |
| United Native American Cultural Center Inc. | -- |