| Name | Deductibility Code |
| Bagaduce Ambulance Corp Inc. | -- |
| Castine Community Child Development Center | -- |
| Castine Community Hospital | -- |
| Castine Conservation | -- |
| Castine Education Foundation | -- |
| Castine Historical Society Inc. | -- |
| Castine Research Corporation | -- |
| Castine Scientific Society | -- |
| Castine Town Band | -- |
| Friends of the Witherle Memorial Library | -- |
| Maine Maritime Academy | -- |
| Maine Maritime Academy Alumni Association Incorporated | -- |
| Navy League of the United States | -- |
| The Castine Womans Club | -- |
| Trinitarian Parish Church | -- |