| Name | Deductibility Code |
| Andrea Lawrence Institute for Mountains & Rivers | 4 |
| Chamber Music Unbound | -- |
| Childrens Advocacy Network | 4 |
| Disabled Sports Eastern Sierra | -- |
| Eastern Sierra Avalanche Center | -- |
| Eastern Sierra Family Resource Center | -- |
| Eastern Sierra Nordic Ski Association | -- |
| Eastside K-9 | -- |
| Foro Latino | -- |
| Harvey Family Charitable Foundation | -- |
| Healthcare Trust of Mammoth Lakes | -- |
| High Sierra Christian Church | -- |
| High Sierra Energy Foundation | -- |
| High Sierra Tri Club | -- |
| Hot Creek Hatchery Foundation | -- |
| Mammoth Art Guild Inc. | -- |
| Mammoth Base Camp Inc. | -- |
| Mammoth Community Church | -- |
| Mammoth Community Foundation | -- |
| Mammoth Elementary Parent Teacher Organization | -- |
| Mammoth High School Booster Club | -- |
| Mammoth Hospital Auxiliary Inc. | -- |
| Mammoth Lakes Celtic Festival Inc. | 4 |
| Mammoth Lakes Foundation | -- |
| Mammoth Lakes Friends of the Library | -- |
| Mammoth Lakes Housing Inc. | -- |
| Mammoth Lakes Jazz Jubilee | -- |
| Mammoth Lakes Municipal Service Corporation | -- |
| Mammoth Lakes Rotary Club Foundation | -- |
| Mammoth Lakes Swim Team | -- |
| Mammoth Lakes the Lighthouse Church Inc. | -- |
| Mammoth Lakes Theatre Company | -- |
| Mammoth Lakes Youth Football League Inc. | -- |
| Mammoth Middle School Organization | -- |
| Mammoth Nordic Foundation | -- |
| Mammoth Ski Education Foundation | -- |
| Mltpa Foundation | -- |
| Mono County Arts Council Inc. | -- |
| Mono County Sheriff Search & Rescue | -- |
| Physiosim Corp | -- |
| Sierra Cycling Foundation | -- |
| Sierra Summer Festival of the Performing Arts Inc. | -- |
| Southern Mono Health Care District | -- |
| Southern Mono Historical Society | -- |
| Thomason Foundation | -- |