| Name | Deductibility Code |
| Beseck Mountain Rescue Inc. | -- |
| Burr District Elementary School Parent-Teacher Organization | -- |
| Candlewood Farm Arts Foundation | 4 |
| Clarity Center of Connecticut Inc. | -- |
| Connecticut Association of Compensatory Education Adm | -- |
| Connecticut Blues Society Inc. | -- |
| Fair Trade Foundation | -- |
| Friends of AA M O R Inc. | 4 |
| H-K Cougars Touchdown Club | -- |
| Haddam Killingworth High School Project Graduation | -- |
| Haddam Volunteer Ambulance Service Inc. | -- |
| Higganum Cemetery Association Inc. | 6 |
| Hk Alumni Association Inc. | -- |
| Inter Ed Incorporated | -- |
| International Society of Differentiation Inc. | -- |
| John A Bertolini Memorial Scholarship Fund | -- |
| The Haddam Scholarship Fund Inc. | -- |
| Warm the Children Inc. | 1 |
| Youth & Family Services of Haddam- killingworth Inc. | -- |