| Name | Deductibility Code |
| Camp Care Inc. | -- |
| Chez Nous Inc. | -- |
| Columbia Burying Ground Association | 6 |
| Columbia Cooperative Nursery School Inc. | -- |
| Columbia Historical Society Inc. | -- |
| Columbia Seniors Organization Inc. | -- |
| Columbia Volunteer Fire Department Incorporated | 6 |
| Columbia-Windham Soccer Alliance Inc. | -- |
| Pride Rehabilitation Inc. | -- |
| Saxton B Little Free Library Inc. | -- |
| Tri-County Arc Inc. | -- |
| Willimantic Orchestra Inc. | -- |
| Wishes on Wheels | -- |