| Name | Deductibility Code |
| Art on the Square Association | -- |
| Christian Lay Enterprises Inc. | -- |
| Church of Christ | -- |
| Church Triumphant Inc. | -- |
| Duke Community Beautification Foundation Inc. | -- |
| Mangum City Hospital Memorial Foundation Inc. | -- |
| Mangum Friends of the Library in | -- |
| Mangum High School Alumni Association | -- |
| Mangum Main Street Inc. | -- |
| Old Greer County Museum & Hall of Fame Inc. | -- |
| Way of the Celts | -- |
| White Flat Cemetery Inc. | 6 |