| Name | Deductibility Code |
| Al Yad | -- |
| Avalon Center | -- |
| Bertha Stebens Charitable Foundation | 4 |
| Bertha Stebens Childrens Theatre Foundation | -- |
| Bible Truth Hall of Clarksville Iowa | -- |
| Camp Tanglefoot Inc. | -- |
| Caring Pregnancy Center | -- |
| Cerro Gordo County 4-H Foundation Inc. | -- |
| Cerro Gordo County Free Health Care Clinic Inc. | -- |
| Cft Foundation | 4 |
| Charlie Brown Community Day Care Center | -- |
| Chemical Dependency Services of North Iowa Inc. | 5 |
| Choral Music Guild Inc. | -- |
| Community Fellowship Church | -- |
| Community Kitchen of North Iowa | -- |
| Community Policing Advisory Board | -- |
| David & Phyllis Murphy Charitable Foundation | 4 |
| Drive-In Theatre Museum Inc. | 3 |
| E R Keig and Alice Keig Scholarship Trust | 4 |
| Education Foundation of the Mason City Public Schools | -- |
| Elderbridge Agency on Aging | -- |
| Farrer Endowment Foundation | 4 |
| Field Memorial Scholarship Trust | 4 |
| First Citizens National Bank Charitable Foundation Inc. | 4 |
| Francis Lauer Youth Services Inc. | -- |
| Full Gospel Fellowship | -- |
| Globe-Gazette Christmas Cheer Fund Inc. | -- |
| Good Shepherd Geriatric Center Inc. | -- |
| Good Shepherd Telephone Reassurance Inc. | -- |
| Harding Elementary Parent Teacher Organization | -- |
| Harvest Time Ministries International Inc. | -- |
| Hawkeye Harvest Food Bank Corporation | -- |
| Health for Life Inc. | -- |
| Herbert Hoover Parent Teacher Organizaion | -- |
| Hospice of North Iowa | -- |
| Humane Society of North Iowa | -- |
| Isbe Foundation Charitable Trust | 4 |
| Jefferson Parent-Teacher Organization | -- |
| Kinney-Lindstrom Foundation Inc. | 4 |
| Lee Endowment Foundation | 4 |
| Lewerke Foundation Inc. | 4 |
| Living Vine Church | -- |
| Macnider Art Museum Foundation | -- |
| Mason City & Clear Lake Electric Railroad Historical Society Inc. | -- |
| Mason City Bmx | -- |
| Mason City Chamber of Commerce Foundation | -- |
| Mason City Community Theatre Inc. | -- |
| Mason City Downtown Association | -- |
| Mason City Fifth Street Church of Christ | -- |
| Mason City Foundation | -- |
| Mason City Little League Inc. D B A Mason City Youth Baseball | -- |
| Mason City Mohawk Booster Club | -- |
| Mason City Public Library Foundation Inc. | -- |
| Mason City Schools Instrumental Music Boosters Foundation | -- |
| Mason City Sister City Organization Inc. | -- |
| Mason City Swim Club | -- |
| Mason City Veterans Memorial Association | -- |
| Mason City Youth Football Association | -- |
| Mason City Youth Hockey Association Inc. | -- |
| Meals on Wheels of Mason City Inc. | -- |
| Mental Health Center of North Iowa | -- |
| Mohawk Archery | -- |
| Newman High School Foundation | -- |
| Niad Center for Human Development | -- |
| North Central Iowa Ag in the Classroom | -- |
| North Central Iowa Genealogical Society | -- |
| North End Partnership Association | 4 |
| North Iowa Alliance for the Mentally Ill | 4 |
| North Iowa Area Community College Foundation | -- |
| North Iowa Band Festival Foundation | -- |
| North Iowa Community Action Organization | -- |
| North Iowa Fair Association | -- |
| North Iowa Figure Skating Club | -- |
| North Iowa Libraries Collaborating | -- |
| North Iowa Transition Center Inc. | -- |
| North Iowa Vocational Center Inc. | -- |
| North Iowa Youth Center | -- |
| North Star Charitable Tr | -- |
| Northern Lights Alliance for the Homeless Inc. | -- |
| Northiowa Outlaws Booster Club Inc. | -- |
| Norwegian Emigrant Museum | -- |
| Oikourmene Religious Center | -- |
| Parents United of North Central Iowa Inc. | -- |
| Pioneer Museum & Historical Society of North Iowa | -- |
| Praise Community Church | -- |
| River City Society for Historic Preservation | -- |
| River City Specialized Activities | -- |
| Seventh Day Remnant Advent Church | -- |
| Shalom Tower Two Inc. | -- |
| Spirit of the Dove | -- |
| Stebens Childrens Theatre | -- |
| Stockman House Museum Foundation | -- |
| Strand North Central Foundation | 4 |
| Stratford Foundation Tr | 4 |
| Studio of the Performing Arts | -- |
| Sugar Plum Tree School | 5 |
| Summer Library Program | -- |
| T L C Broadcasting Corporation | -- |
| The Christian Fellowship | -- |
| Una Vocis | -- |
| United Prayer Tower Inc. | -- |
| United Way of North Central Iowa | -- |
| Ventura Community School District Foundation | -- |
| Wright on the Park Inc. | -- |
| Wright World Foundation | -- |
| YMCA and Rehabilitation Center | -- |
| Young Mens Christian Association | -- |