| Name | Deductibility Code |
| Apollo Education Foundation Inc. | -- |
| Benton Conservation Association | -- |
| Benton County Museum and Historical Society | -- |
| Birthright of Prosser | -- |
| Christian Laymans Missionary Evangelism Association | -- |
| Enhancement Association of Prosser | -- |
| Grace Brethren Bible Classes Northwest | -- |
| Graphe Foundation | -- |
| Hershal Pleasant Memorial Scholarship Fund | 4 |
| Jubilee Minstry of Prosser | -- |
| Margueryte and Bern Mercer Scholarship and Loan Fund | 4 |
| Out West Pet Rescue | -- |
| Prosser Cemetery Association Inc. | 6 |
| Prosser Combined Ptsa 12-2-32 | -- |
| Prosser Community Church | -- |
| Prosser Economic Development Association | -- |
| Prosser Memorial Hospital Foundation | -- |
| Prosser Playground | -- |
| Prosser Rotary Club Foundation | 4 |
| Prosser Scholarship Fund | -- |
| Prosser Senior Citizens Club | -- |
| Prosser Swim Team | -- |
| Prosser Tower Site Inc. | -- |
| Prosser United Good Neighbors | -- |
| San Diego Montessori Society Inc. | -- |
| Walter Clore Wine & Culinary Center | -- |
| Yakima Basin Storage Alliance | -- |