| Name | Deductibility Code |
| 309 Club Inc. | -- |
| Artists Guild | -- |
| Atlantic Cemetery Association | 6 |
| Atlantic Coca-Cola Center and Museum | -- |
| Atlantic Community School Foundation | -- |
| Atlantic Food Pantry Inc. | -- |
| Atlantic Junior Sports Association Inc. | -- |
| Atlantic Right to Life | -- |
| Atlantic Rock Island Society | -- |
| Cafe Zanzibar | -- |
| Cass County Genealogical Society | -- |
| Cass County Housing Corporation | -- |
| Cass County Housing Management Corporation | -- |
| Cass County Meals on Wheels | -- |
| Cass County Medical Clinics Inc. | -- |
| Cass County Memorial Hospital Auxiliary | -- |
| Cass County Memorial Hospital Found Ation | -- |
| Cass County Morman Trails Association | -- |
| Center for the Advancement of Self Sufficiency Inc. | -- |
| Family Crisis Support Network | -- |
| First Church of Christ | -- |
| Friends of the Atlantic Iowa Animal Shelter | -- |
| Helen Welter Foundation Inc. | -- |
| Leona Thiele McKenney Trust | 4 |
| Lullabye Foundation | -- |
| Nishna Valley Trails Inc. | -- |
| One Little Light Inc. | -- |
| Partnership for Progress Inc. | -- |
| Senior Alumni Scholarship Foundation | -- |
| Senior Citizens of Cass County Atlantic C S C C | -- |
| Southwest Iowa Family Services Center Inc. | -- |
| Southwest Iowa Housing Trust Fund Inc. | -- |
| Southwest Iowa Mental Health Center | -- |
| Sunnyside Bible Chapel | -- |
| Sunshine Homes Inc. | -- |
| Young Mens Christian Association | -- |
| Zion Recovery Services Inc. | -- |