| Name | Deductibility Code |
| Amherst Railway Society Inc. | -- |
| Connecticut Council of Language Teachers Inc. | -- |
| Friends of the Keep Homestead Museum | -- |
| Friends of the Monson Free Library | -- |
| Grace Makepeace Trust for Historic Preservation | 3 |
| Greene Room Productions Theatre Prod & Educational Outreach Inc. | -- |
| Monson Arts Council | -- |
| Monson Basket Ball Association Inc. | -- |
| Monson Free Library and Reading Room Association | -- |
| Monson Historical Society | 3 |
| Monson Home for Aged People Inc. | 3 |
| Monson Senior Citizen Center Club Inc. | -- |
| Monson Summerfest Inc. | -- |
| Monson Swim Team Boosters | -- |
| Quaboag Highlanders Pipe Band | -- |
| Safe Animal Rescue and Haven | 3 |
| Silver Creek Habitat Inc. | -- |
| Wings of Hope Inc. | -- |