| Name | Deductibility Code |
| Friends of Hampden Senior Citizens Inc. | -- |
| Friends of the Hampden Free Public Library Inc. | -- |
| Hampden Pto | -- |
| Hampden Volunteer Fire Department | -- |
| Hampden Volunteer Fire Department Inc. | -- |
| Hampden Volunteers in Public School Inc. | -- |
| Historical Society of the Town of Hampden Inc. | -- |
| Leap Agility Club of Central Mass | -- |
| Massachusetts Academy of Sciences Corporation | -- |
| Minnechaug Land Trust Inc. | -- |
| Police Officers Association of Hampden Inc. | -- |
| Recreation Association of Hampden Inc. | -- |
| Theatre Guild of Hampden Inc. | -- |
| Wood Family Foundation Trust | 4 |