| Name | Deductibility Code |
| Ann M and Sultan Ahamed Foundation | 4 |
| Avatar Meher Baba Foundation Inc. | 4 |
| Burnetts Corners Preservation Society Inc. | -- |
| Coastal Environmental Services Inc. | -- |
| Connecticut Association of Independent Schools Inc. | -- |
| Connecticut House of Prayer Inc. | -- |
| Connecticut Public Schools Rowing Association Inc. | -- |
| Connecticut Songwriters Association Inc. | -- |
| Counseling & Stress Research Center Inc. | -- |
| Denison Pequotsepos Nature Center Inc. | -- |
| Denison Society Inc. | -- |
| Elm Grove Cemetery Association Greenmanville Ave | 6 |
| Foundation for Fiduciary Studies | -- |
| Groton Parks Foundation Inc. | -- |
| Groton Regional Theatre Inc. | -- |
| Hamm Family Foundation Inc. | 4 |
| Hannahs Gift Inc. | -- |
| Holstein Foundation | 4 |
| Honorary Deputy Commissioner Foundation Inc. | -- |
| Imagery Learning Inc. | -- |
| Institute of Continuing Education Inc. | -- |
| International Association for Aquatic Animal Medicine | -- |
| Local United Network to Combat Hunger | -- |
| Lower Mystic Cemetery Association | 6 |
| Marks Family Foundation | 4 |
| Mary L Jobe Akeley Trust & Peace Sanctuary | 3 |
| Mystic & Noank Library Inc. | -- |
| Mystic Area Shelter and Hospitality Inc. | -- |
| Mystic Art Association | -- |
| Mystic Babe Ruth League Inc. | -- |
| Mystic Ballet Inc. | -- |
| Mystic Chamber Foundation Inc. | -- |
| Mystic Community Bikes | -- |
| Mystic Congregational Church Inc. | -- |
| Mystic Flag Committee | -- |
| Mystic Hook & Ladder Co Inc. | 6 |
| Mystic Irish Parade Foundation | -- |
| Mystic Nautical Heritage Society Inc. | -- |
| Mystic River Chorale | -- |
| Mystic Seaport Museum Inc. | -- |
| Mystic Womans Club Inc. | -- |
| Mysticalligraphers Inc. | -- |
| Native Sun Symphony Orchestra | -- |
| Northeast Academy Parent Teacher Organization | -- |
| Ocean Technology Foundation Inc. | -- |
| People Advocating Therapeutic Homes Inc. | -- |
| Peter and Carmen Lucia Buck Foundation Inc. | 4 |
| Reforest the Tropics Inc. | -- |
| Roger A Cunningham Evangelistic Inc. | -- |
| Rotary Club of Mystic Scholarship Inc. | -- |
| S B Butler Pto Inc. | -- |
| Sandal Clay Stuart Fund to Promote Mental Health Research | -- |
| Sea Research Foundation Inc. | -- |
| Stonington High School Graduates Scholarship Fund Inc. | -- |
| The Africa Education Initiative | -- |
| The Douglas S and Barbara J Barrett Family Foundation | 4 |
| Traditional Small Craft Association Inc. | -- |
| Young Mens Christian Association of Mystic Connecticut Incorporated | -- |