| Name | Deductibility Code |
| Allen Eiry Senior Center Inc. | -- |
| Betty Jane Memorial Rehabilitation Center | -- |
| Bible Study Church | -- |
| Black Swamp Vbc | -- |
| Buckeye Border Collie Rescue Inc. | -- |
| Charles D Bud Hering Jr Foundation | 4 |
| Charles R Ardner Memorial Scholarship Trust | 4 |
| Chieftain Youth Football | -- |
| Christian Counseling Center at First Lutheran Church | -- |
| Christs Church at Tiffin | -- |
| Clinton Athletic Association | -- |
| Clinton Pto | -- |
| Community Hospice Care | -- |
| Council for Retarded Children of Seneca County Inc. | -- |
| Court Appointed Special Advocates of Seneca and Sandusky Counties | -- |
| Crimson River Fellowship | -- |
| D & L Services of Tiffin Inc. | -- |
| Equirest Incorporated | -- |
| Family Counseling Service Inc. | -- |
| Financial Assistance for Cancer Treatment Inc. | -- |
| Findlay Area Pharmacy Association | -- |
| Fish of Tiffin | -- |
| Foundation of Tiffin Rotary Club | -- |
| Franciscan Earth Literacy Center | -- |
| Freedom Trails Interactive Therapy Farm Inc. | -- |
| Friends and Descendents of Johnsons Island | -- |
| Friends of Seneca County Park District | -- |
| Heartbeat of Tiffin Inc. | -- |
| Heidelberg University | -- |
| Kiwanis Club of Tiffin Ohio Foundation | -- |
| Krout Parent-Teacher Organization | -- |
| Krout School Pto | -- |
| Leadership Seneca County Inc. | -- |
| Lifelight Inc. | -- |
| Lincoln School Pto | -- |
| Mohawk Community Library Foundation Inc. | -- |
| National Machinery Foundation Inc. | 4 |
| Noble Elementary School Parent-Teacher Organization | -- |
| Ohio Region 1 Disaster Animal Response Team | -- |
| Old Fort Schools Renovation Committee Inc. | -- |
| Old Fort Seneca Community Park | -- |
| Patchworks House Inc. | -- |
| Pleasant Union Cemetery Asso | 6 |
| Promise Gate Inc. | -- |
| Renaissance House Inc. | -- |
| Royal Racing Montegnee F C | -- |
| Russell and Marguerite Stephenson Foundation | 4 |
| Scope International Inc. | -- |
| Seneca Aquatic Club | -- |
| Seneca Community Chaplain Corps | -- |
| Seneca County Agency Transportation | -- |
| Seneca County Chapter of the Ohio Genealogical Society | -- |
| Seneca County Commission on Aging Inc. | -- |
| Seneca County Firemans Association | -- |
| Seneca County Home Auxiliary | -- |
| Seneca County Homeless Coalition | -- |
| Seneca County Humane Society | -- |
| Seneca County Jail Chaplaincy Committee | -- |
| Seneca County Jr Fair Foundation | -- |
| Seneca County Jr Fair Foundation Maintenance and Repair Charitable | -- |
| Seneca County Museum Foundation Inc. | -- |
| Seneca Industrial & Economic Development Corp | -- |
| Seneca Re-Ad Industries Inc. | -- |
| Senior Community Center of Kiwanis Manor Inc. | -- |
| Shiloh Cemetery Association | 6 |
| St. Francis Home Auxiliary | -- |
| St. Francis Villas Inc. | -- |
| St. Vincent Depaul Society | -- |
| Taiho Kogyo Tribology Research Foundation | 4 |
| The Britten J Hess Memorial Scholarship Trust | 4 |
| Tiffin Area Babe Ruth League Inc. | -- |
| Tiffin Art Guild Inc. | -- |
| Tiffin Band Boosters | -- |
| Tiffin Biddy Wrestling Club | -- |
| Tiffin Calvert High School Educational Foundation | -- |
| Tiffin Charitable Foundation | -- |
| Tiffin Community-Ymca Recreation Center Inc. | -- |
| Tiffin Ctr Parents & Vol Asso for Ret Citizens Inc. | -- |
| Tiffin D-League Baseball | -- |
| Tiffin Fort Ball Neighborhood Corporation | -- |
| Tiffin Glass Collectors Club | -- |
| Tiffin Historic Trust Inc. | -- |
| Tiffin Jaycee Foundation Inc. | 4 |
| Tiffin Masonic Relief Association | -- |
| Tiffin Middle School Pto | -- |
| Tiffin Rangers Inc. | -- |
| Tiffin Seneca Day Care Center Inc. | -- |
| Tiffin Seneca Library Foundation | -- |
| Tiffin Seneca United Way Inc. | -- |
| Tiffin Theatre Inc. | -- |
| Tiffin University | -- |
| Tiffin-Seneca Teen Center | -- |
| Tornado Athletic Boosters Club | -- |
| Tu II | -- |
| US S Goldsborough Ddg 20 Association | 6 |
| Washington Elementary Pto | -- |
| Webster Foundation Inc. | 4 |
| Women A C T | -- |